@marton4710 Oooh yeah, I have thought of a few things people do.
It makes me cringe when people (usually MEN) sneeze stupidly loud.
Fake posh accents. Like Toffo who won 'I'm a celebrity.' She is so fake posh it makes my teeth itch. Soooooo cringeworthy.
Also, Phil and Holly off This Morning make me cringe, with their little private jokes, and hilarious giggling fits. And Holly's squeaky voice jars me.
People who have 'I can't stay at home, I'm a key worker!' on their facebook profile pic. vom 
Also when MEN say 'cheer up luv' or 'smile, things could be worse!' THAT makes me cringe. (And you just KNOW they wouldn't say this to another man.)
When men 45+ try to chat up young women 20+ years younger, and try and be 'funny,' and think they've still got it with da laydeeez!
Public displays of affection. Smooching in public. No-one wants to see that! 
And for some reason it makes me cringe when people walk along holding hands. I know it's supposed to be all romantic and shit, but in reality, it's uncomfortable, restrictive, and awkward, walking along holding hands with someone.
ANYONE who tries to say they want people to support their small business, when that 'small business' is fucking 'Bodyshop At Home!' Or some other wanky MLM!
The Peleton advert. 'Here's to you Jeanette Fosdyke of Milton Keynes. YOU CAN DO IT!'
Pop of colour is cringeworthy (as a few people have said.)