idk i don't think there are many actually petty reasons. sometimes my brain just says no, but it doesn't get many opportunities. someone ordered too much dessert once. but there were background factors going on. also the same deal in the few other times i called things off really early. at the early stages i am quite flighty. i prefer it when they do and say as little as possible so they don't scare me off. i like to know that we both feel very awkward. i don't think i would not date someone just because they were confident though... hmmm... or would i? if they're too forward or too fast, i don't like it. i don't think that's a petty reason though. also i don't think crudeness is a petty reason to reject someone, unless its just a manner of speech rather than a mode of thinking.
Smoking, especially cigarettes but also vape because I've cut back a lot over the last two weeks and am making progress quitting. Just cigarettes smell and taste awful. I guess I'd be okay with it if they were quitting as well, then it would turn into an activity together.