You’re fine if you play with friends. If you play with randoms, use the squelch button liberally. The UI makes it easy to mute people.
I’m still hoping that most of those people are just kids acting out trying to get a reaction out of you with the crudest comments. If they are adults, then that’s pretty sad. There’s not much Riot can do about it when you’re one of the most popular online games. Why can’t more kids be like Oliver from Nino Kuni?