use to get those ALL the time in mvc2 on ps3 and street fighter 4. It's really not a big deal imo, 95% of people would never do it to your face, so they're not worth your time. eventually, i just started going along with their "diss" like : "yeah, i'm totally scrubby, you played great!", they would quickly change their tone and reply something back nice, sometimes sending a friend request.
I 100% don't do online chatting or messaging since that generation, such an over rated experience, Nintendo has the right idea imo, but you SHOULD be able to chat with actual friends.
https://www.youtube.com/channel/UCbchUmHiEvZ1m3b9HgW5syg
VIDEO GAME MUSIC MASHUPS