The brawl thing I'm not sure about, they were in a play venue and maybe the bored-looking woman was checking it didn't get too out-of-hand, though you feel it already had. If they were allowed to carry on like that for a long time YANBU to judge their parents I think.
The bottle thing I think you are probably BU. I never used bottles (I know, get me a medal) and my car-seats never went out of the car but aren't I right in thinking the baby would have been facing them so no need to assume there was no interaction, nor that it is the way they normally feed, nor that she even had a full feed.
I do love judging, though since having ds2 I am far more tolerant as my own standards have slipped so much. I did see something similar to your OP the other day that I judged though.
Our city centre has a small, free softplay and a couple came in with a 2ish ds and a tiny (2month max, I think) baby who was propped up in a pram with bottle wedged as you described. They were there for 10-15 mins or so and, especially since there were two of them, I couldn't understand why they didn't take her out and feed her themselves. I know you can be in a rush etc but they were in one place, with seats and babies of that age need to come first - however 'inconvenient'. To be fair, the dad did look at her and say, "Is that nice?" in a nice voice but that was it for interaction.
When they wanted to leave, and they hadn't been there long at all, their ds wouldn't come out so the dad went in to get him - he whined a bit but there was no massive tantrum. While they were getting his shoes on the dad seemed to be piling punishment after punishment on him: "When you get home, there'll be no toys out and you can go straight to bed. In fact, you can have your lunch on your own in your room!" There was no shouting but it seemed really nasty, especially because the dad didn't really seem that angry, iyswim, so it wasn't as if he'd lost it.
I know I hadn't seen how the boy had behaved the rest of the day but it seemed to me that they'd taken him there for a ridiculously short time and then over-reacted when he wouldn't come out. I think a 2 year old should never be sent to eat alone and empty threats are pointless, though I rather hope it was an empty threat in this case. The whole thing really made an impression on me and I did judge them (can you tell?
.)
BTW, I do seem a bit obsessive but the place is tiny and they were right next to me. Ds1 was off being an Octonaut, ds2 was asleep and I forgotten a book, I'm not weird - honest!