My pet peeve of all time is when you contact a prospective fellow sessioner, and get the reply, only to find they have slipped into role from the outset
I get SO annoyed when they give (sometimes s c a n t) details of themselves, but call you "boy" and INSIST you call them "Sir" and also want chapter & verse of your experience and limits
I usually address them as "piss off" as they tend to be wannabees !!!!!
Any other "pet peeves" out there people would like to share?

Simon