Oh I see, being called a spastic girl is totally on the side of acceptability. Mmhm.
Okay, lets think about it.
If I call you a friend, what does this mean? What is revealed to the reader? Nothing. The word friend is so overused it doesn't even imply that you may be a homoloveual, I'm just slinging stuff at you.
Bolster is saying something here. He's saying that when he responds to you, you act irrationally in his opinion. Instead of saying this like a bureaucratic robot, he speaks in English and laces his words in such a way that it offends you.
"
You overreact to harsh criticism" becomes "
you jump up and down like a spastic little girl, screaming "EVERY DAMN TIME"."
Although this is insulting, it's not a "petty insult."