In no particular order.
Nail biting, best get your protein from a different source, surely, it tastes better plus your fingers will look better.
Anyone who drinks moderately and often.
Stingy, mean, miserly, miserable penny pinching.
Constant moaning about your ex. Most of us have a history, but there's no need to go on and on about the past.
Sexually dysfunctional, (neither willing to admit to nor seek help for it); for the record, it's not that common, it doesn't happen to every guy, and it is a big deal!
Criticising how much washing up liquid I use, seriously, lighten up, who doesn't like bubbles?
Poor sense of humour.
Someone who feels the need to talk about their job almost non stop.
No thank you- I love what I do, but it's not all that I do.