It was absolutely ridiculous (and disturbing really) that op has had to defend herself against at a poster claiming she "blithely" goes around chatting to "randoms" and needs to learn how to deal with the consequences; that (according to him/her) young people use chatting about shared interests to chat people up.
She wasn't blithe. They weren't randoms.
And young people chat about shared interests with both people they might be romantically or sexually interested in .... And people they are not. As do all ages of people.
If a certain type of man takes chatting about shared interests and general friendliness and civility as a come on ... That's a reflection of them being mal adjusted & delusional, and is not the responsibility of the other person who's only being friendly and exercising a fairly basic and harmless trait of humans to communicate, discuss and find common ground.
In any case, it doesn't sound like any male the op "blithely" - wtf - spoke to took it the wrong way. It was only her ex bf who read things into the interaction that were not there on either side.
Because her ex bf has serious issues. A deeply unhealthy, poorly adjusted, posessive, insecure, jealous, controlling person.
Unfortunately I know all about men like that, having suffered one for 13 months.
And I had many similar incidents ... Where I literally could not speak to another man, with the ex often present and sometimes the other man's partner present without being accused of giving them the impression I was available/interested, without it being seen as inappropriate towards him.
They are nut jobs and there is no changing them. They don't want their partner to function like a normal, free human being, they want them in a box.
Dealing with their "greivances" criticisms, demands, dealing with the stress of it is a type of abuse, ahd is detrimental to your me ral health, and ultimately perhaps that has a knock on effect for your physical health too. They are not fit to be partners. I'm glad you're out op, please jerk it that way.