I find my DH twice as irritating as I did before I was pregnant, so I do realise it is probably my hormones making me feel like this 
Here is a list of what I find most irrationally irritating about him:
When I've been awake for hours in the middle of the night....he is fast asleep 
Same applies for his snoring.
He does not have the ability to be a mind reader when I'm pissed off about something.
Him doing a stupid dance about the living room in order to get a laugh off the DC's does not seem at all funny to me.
Cocking his leg when he farts is no longer funny either.
We are no longer trying to conceive a baby so him going at it like a bat out of hell when having sex no longer has the same appeal.
Him waving his willy around like a windmill makes me want to chop it off.
The fact that I am suffering with HG so the housework has fallen on DH to do (as well as working fulltime) but he only has time to clean the bathroom once a week.
When he calls our dog "the puppy princess".......highly bloody irritating.
I'm sure there are more things and I'll add to the list later.
Does anyone else feel like this about their other halves?