How to stop trash talking others when playing video games?

Specifically for fighting games. Whenever I play Mortal Kombat 1 and start to lose, I trash talk on mic or message them, insulting them. But after, I do feel bad and I apologize. I just want to get over this toxic trait.

It used to be worse, as I used to yell a lot and smash my controller, but I think the trash talk was the replacement for that trait