I was reminded the other day that not all things that are extremely, gratingly annoying are special snowflakery or even rude. I use my department's break room for lunch most days, as do many other people. I tend to eat later than most, so I've gotten kind of used to being in there by myself (or mostly by myself). However, there are sometimes other people in there, and they sometimes like to chat to each other. I usually read.
So the other day, I was trying to read, and there were a couple of people sitting at the table behind me and talking. One of them happens to have a voice that carries extremely well, and she can get kind of loud without realizing it. Even though I like this person a lot, her conversation was making it impossible for me to focus on what I was reading, because it was just the conversational equivalent of piercing. It grated on my very last nerve. I would have finished my lunch break elsewhere if I'd been done eating, but it wasn't practical.
But the thing is, even though I was seriously frustrated with the situation, she wasn't a special snowflake. She wasn't even rude. Her conversation was taking place in an appropriate location, and while she was talking loud enough that I couldn't ignore her, it wasn't loud enough to be rude. In the end, no matter how annoying I found it, it was my problem.
I think that's the type of thing Bexx27 meant when she said that sometimes "it's just life." Sometimes people do things which are genuinely extremely annoying, but not actually rude. It happens when you have to interact with others, and it especially happens when your location is only sort of chosen by you (like waiting for tires to be changed or sitting in the office breakroom on your lunch break).
I do agree that parents not actually trying to parent (even if they seem to be going through the motions) are being inconsiderate to others around them. But I don't think that parents whose children are misbehaving are automatically in that category. Sometimes children don't behave, even if you're the best parent in the world. Everybody has off days, and kids tend to act out when they're having one. Parents should do everything in their power to limit the impact of that on others, but sometimes "everything in their power" is not going to prevent others from witnessing annoyingly bad behavior.