Don't add random people!

This has literally happened to me twice. Someone randomly adds me on my main and of course I add them back. So we talk about what champs we play, roles etc and we get into a game. It's all fun and games when we're winning but the next part really pisses me off. Seriously, if we drop one game all of sudden it's "Why play if you're not good." That is literally annoying, I play ranked to get better alright? I'm sorry that we lost A SINGLE GAME. They proceed to rant and then when the games over they'll remove me from their friend's list. I'm seriously done with all of this.