Reporting summoner names

There is someone I had on my friends list with an offensive and racist name, but I don't know how to report people out of game. I'd rather not play a game with him, as he is a very toxic and unpleasant person to play with. Is there a way to report racist summoner names outside of the post-game lobby? I've tried logging in to Riot Games support, but the page doesn't load for some reason, even with all my browser extensions disabled. Either way, I hope there is a way to get this person to at least change their name.