When I'm purely hypomanic I tend to be euphoric and giddy and quite sociable. For me, irritability is mostly associated with mixed episodes/dysphoric mania, and to a lesser extent depression (sometimes but not always). When I'm mixed/dysphoric, my irritability is off the charts, and so is my anxiety. In that state I can easily get into arguments or fights, say hurtful things, make rash decisions, etc.