Some of DP's habits I find quite frankly repulsive and it's caused major rows between us.
Some of things he does which I find disgusting:
-Never washes his hands if he's done a wee
-when he empties his bowels, he'll only rinse his wiping hand with water
-this morning I caught him drinking out of the milk bottle when it's no where near empty (and he has a brown tongue atm so it means no-one else can use it now and it was a 6 Pinter) 
-doesn't wash himself everyday
I could go on but these are the main issues that are driving me mad. He thinks IABU and gets very defensive when I confront him.