things that suck

Domestic violence and abuse (especially when children are the victims)

Women who defend their abusers (especially when children are amongst the victims)

Men who treat women like chattel

Women who like to be treated like chattel

Loud mouth jerks (especially if they are drinking)

Inconsiderate smokers

Bigots, racists and bullies

Proselytizing religious fanatics (of any religion or sect)

Proselytizing political fanatics (of any party)

Know-it-alls [myself not included]