> Nothing gets stopped by merely refusing to extend some small measure of legitimacy to whatever is deemed "bigoted".

The targets of bigotry being subjected to both the bigotry itself and the additional insult of the community they are participating in legitimizing it is, in fact, stopped by the community not legitimizing it.

As that has long been a central purpose of RPG.net policy on acceptable participation, I think this particular rule is probably doing exactly what is intended.

> These policies and norms do not change minds

Perhaps, but in this case they aren't intended to, so that's not an argument against the policy.