The reason it can be discounted is that being called names in online games is hardly something exclusive to minorities. If you go play League of Legends for a week it doesnt matter who you are, you will have been called nasty names by someone. If they know some aspect about you they will try to attack that, if they dont it will just be random insults hoping that something will stick.
This behavior is not fun or good or excusable, but it is not a problem steming from racism. Trashtalking is older than video games.
Also if your bad experience is with other people calling you names, that problem will not be solved by trying to shove sensetivity readers into the studio making the game, that random troll you play with online is still going to call both you and me names, trying to rile us up.
If you are really concerned about racist material available for purchase I suggest you focus on trying to get Amazon to pull mein kampf off their store. If the source of racism in society is what books and media people have acess to then surely mein kampf is a much bigger problem than some DnD game?
