Ugh, so many, and I'm not even picky 
The man from OLD who proclaimed himself a 'foodie' yet pulled the most awful faces looking at every menu. Eyed every 'unusual' item with suspicion and THEN GOOGLED it right there and then at the table
"What is... bul...gur?" - Turkish restaurant - "You do have the option of chips if it's not your thing?" "Hm it doesn't look very nice anyway." Went on constantly about money, how much his friends earned, how he deserved a promotion, when the bill would come always looked uncomfortable etc. Ugh.
Physical things that caused the ick... After a few weeks of dating another man invited me away for a few days. I wouldn't normally so early on but he had a voucher for somewhere to go and it was due to expire with no one else to go with. I was ready to kill him or myself by the time we got back.
When driving on motorways, he had almost a tic where he CONSTANTLY had to pick his nose. Not subtle about it either, twisting his finger round and round for ages. Turned my stomach. I gritted my teeth and actually began counting the seconds between him stopping, putting his hand on the steering wheel, and then compulsively his finger heading straight for his nose again. Never got above 10 seconds 
When he asked me to open the sharing bag of crisps he'd brought for us as snacks, put his bogey-ridden paw straight in and rummaged around. He was very confused when I said I didn't fancy any...
In fact I can't say any others because I'm just getting irrationallly annoyed 