I try to be calm most of the time... but I value not having my music associated with stress or sadness. I did a gig recently and it was the best gig I’ve done in a decade...It's not often someone asks for criticism, gets it in spades, and takes the advice so gracefully.
Feeling that way is cool. Venting is cool. But people always remember how you treat them and how you made them feel. Sending a clear, firm message without rancor is a valuable skill, as @LBS-bass eloquently demonstrated.
Kindness has nothing to do with talent/skills/chops on any instrument. Being the best player around is no license to be a tool.
Bad gigs whittle away that positivity for me. So, until I’m ready to risk chipping away at my built up optimism, I’ll be more selective in what gigs I take...