I tried to post earlier, but something went wrong. I hope I don't end up posting twice.
I have so many I almost feel embarrassed. Here are a few for starters:
False nails and long nails. Sorry. I like nails to be short, neat, and clean. Nail polish can be okay, though, if it's tidy and not chipped.
When I find out that someone I like is a cat lover and /or owner, I feel crestfallen. It really puts me off them. I am not a cat lover. I trod in cat poo (I have never owned a cat) in my own garden yesterday - whilst wearing my nice trainers - and am still very upset about this...I find many cat owners are very blasé about their pet doing its business in someone else's garden, and I find this totally unreasonable.
I quite like terms of endearment as a rule, but not hun / hunny, I'm afraid. I much prefer sunshine, sweetheart, poppet, or dear, dearie, love, pet. Haha.
When someone says "chalkboard", I just think, what utter nonsense! It's a blackboard. Unless it is a different colour, of course.
People who tweet about or post everything. Everything! Come on! Life is too short to be lived wholly through a screen or lens.
Unnecessary Americanisms. When a native English-speaking Brit says "movie", or "my bad", or doesn't use ordinal numbers in the date (i.e. they say "September nine", instead of "September the ninth"), I go right off them.