To be honest I get quite irritable when im both depressed and hypomanic.
When i'm depressed, everyone just annoys me and i can't deal with people and i get really overwhelmed and i'll just snap at the people closest to me ie my parents, my friends, my siblings etc
When i'm hypomanic its more the fact that people aren't exactly going at my pace. hey're not thinking the way i am, they're too slow. I'll get quite impatient with people an that's when i get irritated and snap at them.
I mean, this is just me, i'm not too sure about everyone else
Best wishes