Apologize in advance for format and language as I'm on mobile and English is my second language.

FYI we are a group of friends, around 10 people who play poker every Friday/Saturday night. We only play for fun so $20 buy in, 10¢/20¢ blind but as the nature of the game  a person can win/lose $100 a night is normal.

Recently, a girl got a boyfriend and he kinda joined our poker game and be a member of our group. The thing is he is new to poker and often shows bad poker etiquettes such as action out of turn, string bet, card calling etc. 

I tried to tell him mutiple times but he usually laughed it off or other people told me to losen up because it is just a friendly game. Last week he did somes angle shooting that I'm not even sure he did it on purpose but I was pretty annoyed and called him out. After that he was kinda quiet and showed attitude toward me like throwing chips and not calling actions. The thing is others do not seem to care about his table etiquettes.
 
Am I the asshole for trying to enforce the manner in a friendly poker game?