That was really unprofessional and not the right way for you to address grievances with your co-workers, nor the right tone. When your boss asked if anyone had any questions, she probably meant in general or about what had been discussed previously at the meeting, etc., rather than inviting anyone to publicly call out someone else! And by saying a particular room, yes, you were naming names as in the staff who work in that room.
I own a company and this kind of reminds me of a time when I had an employee who was constantly trying to air her grievances with other employees publicly, calling them out on what she thought they were doing wrong and telling them what they should change about their jobs, etc. She wasn't their manager- in fact, she would even speak like this to the manager about his job- and no one had put her in charge of policing others but she seemed intent on doing so.
I would have had no problem with her coming to me and telling me of an issue she had with other employees or the manager or myself that was preventing her from being able to do her job as well, or that she thought was inappropriate or maybe even suggestions as to something she thought was going wrong or how work could be done better by others, etc., but it was completely inappropriate for her to do in a public forum.
She was otherwise a good employee and very productive and I relied on her for a lot but she wouldn't stop being like this and I couldn't allow her to constantly be ruffling the feathers of other employees. It came to a head when she tried to tell the manager he was doing his job wrong and snapped at him in a rude way on a public channel in Slack (this was during Covid/remote work) and he messaged her privately to tell her that he was sorry that he had accidentally done something to make her job harder and that he's open to feedback but that it isn't right of her to talk to him like that and get him attitude publicly calling him out for what she thinks is him not doing his job well enough. He asked her to speak to him politely and to address any issues one on one so they could communicate and solve it together and she completely ignored him and didn't respond to him at all.
So, I had to get involved and I tried to talk to her privately simply to reiterate that she needs to address her colleagues in a civil, professional way even if it's on Slack (trying to give her the benefit of the doubt that she might not understand online communicate etiquette even though we had been over similar things with her communication style in person during office meetings pre-Covid, etc.), and telling her that I need her to communicate with the manager and try to work out any issues with him rather than ignore him, and to discuss any issues she has about his work with him one on one, or with me one on one if it's something she wouldn't feel comfortable telling him, but not publicly and not disrespectfully.
She totally blew up at me and said that I'm wrong and that I owe her an apology. She wanted me to take her side in what she believed was a dispute between them I guess, but which I viewed as a simple workplace communication request. I honestly didn't care who was right or wrong about the issue but my problem was with the format and tone in which she had chosen to address it, and her refusal to speak to him about it one on one after calling him out publicly on it, or to even hear another person's point of view and consider it and calmly state her own point of view instead of snapping at people and then completely ignoring people (let alone her manager) or blowing up at people (let alone her boss, me, haha) for not automatically agreeing with her or seeing things her way.
It resulted in her saying that unless I apologized to her and agreed that she was right, she would quit. I said that I was not going to apologize for speaking with her about an issue that I thought needed handling when I'm the boss and she's the employee, and that we were obviously at an impasse. She said, "You're right, we definitely are, this is ridiculous, I quit."
I was really glad she quit as it saved me the hassle of having to worry about an unemployment claim or prove that she was fired for cause after repeatedly being talked to about the way in which she addressed issues at work or tried to boss other people around even when she was the subordinate, etc. (I don't even like all that workplace hierarchy stuff and try to run a casual ship, which I guess was the problem because she took that to mean she was in charge and threw a fit whenever I'd remind her that she wasn't.) But if she hadn't quit then I would have had to have fired her since she was being too difficult in the workplace and causing problems for other employees and now me. Although there were a lot of things she did that I had to start doing myself while training someone new to do instead, it was worth it to be rid of her because she was too much of a headache.
All of this to say that you should work on your etiquette and communication style at work if you want to be there for very long (or anywhere else really). Asking if someone has any questions or something to say is not an invitation to attack your co-workers' work publicly. Causing drama or hurt feelings unnecessarily will get you canned unless you are stubborn enough to quit unless everyone agrees with your way of doing things and communicating about things, like my former employee was.
There are really better ways and places and times to have addressed your concerns. I'm not even sure if it was any of your business but if the staff not tending to the room enough was influencing your work then you could talk to them about it one on one in a civil, professional manner to see what the problem might be and how it might be resolved in a mutually agreeable way, and if that didn't solve it then you could respectfully approach your boss privately and let him know that your ability to do your job was being impacted by someone else's failure to do theirs, and even then, you would want to frame it in a more neutral way than you did at the meeting.
You should say something like, "In order for me to do X, Y needs to be done first, and Y has not been done on dates Z, A and B so I have had a really hard time doing X, and so I wanted to bring it to your attention and see if you can help solve this problem." Then the boss might ask if you've spoken with the employees who are supposed to do Y and you can say that you have but they disagreed with your take on things or refused to do the job etc. and so you escalated the issue.
Sometimes if there are severe personality clashes or a toxic workplace or something like that where you don't think it's a good idea to talk to the co-worker directly, you might go directly to your boss but it should still be privately and in a way that keeps the focus on your own job and on helping you be able to do it, rather than seemingly pointing the finger at other people just to call them out on things like it seems to me that you were doing at the meeting. (Although I don't have the full context since your OP was very brief.)
I wonder if your workplace has some kind of inter-personal communication skills training that HR offers or if not, you might want to read some books or watch some videos on the topic if all of this sounds foreign to you. From your OP It sounds like you're flabbergasted as to why what you said/how you said it wasn't well-received, so it seems like something you should probably educate yourself on just for the good of your own career.