The things that annoy me the most are:
1. a pilot coming onto the frequency without listening out for a few seconds first, and thus stepping on a readback.
2. a pilot being told "standby" but going ahead with his life story anyway, and
3. [and this is really not that important but hey, they have the job they always wanted!] grumpy pilots.
Trust me, pilots don't appreciate this type of r/t use either.
The other point would be that if you're speaking about a transport aircraft, this type of behavior doesn't necessarily reflect on the pilot at the controls, only the radio operator.