queer phobic. I'm not queer but many of my friends are. I don't need that negativity in my life.
smoker. Maybe a pass if they are actively trying to quit. Maybe. Most active smokers I've known have kind of been assholes about it, though.
littering. Sometimes combined with the above when smokers throw their butts on the ground
being a jerk about people having healthy hobbies. Like, just let someone enjoy some video games or bird watching or whatever. I can't with people who are like "omg that's so childish you still [play games/read fiction/go to the zoo/whatever]?".
being anti-consent. I've met a few women who are like "just do stuff and I'll tell you if I don't like it" and I'm like lady there's some "stuff" that can be done that by the time it's happening , the damage is done. Let's just have a conversation about what we like and what our boundaries are.
I was going out with this guy I really liked. Probably 3rd or 4th date. We decided to take a drive, and went to a local grist mill. Walked around, had a nice time. Took the scenic route home on this road that ran along a pristine Tennessee Creek. He was drinking a Gatorade or something, and when he finished it, rolled down the window and chucked the bottle out into the creek.
I stopped the car, made him go pick it up (or I wasn't going to drive him the 20+ miles home), and never called him again. Fuck. That. Behavior.
This is so many people on IRC it's not even funny.
Especially most libera mods. Their god complexes can be seen from space, they're often highly unreasonable, hold decades long grudges and have a hair trigger for anyone even remotely trying to be funny.