Okay. Why does the DM need special protection from rude players, but players should just put up, shut up, or walk away from rude DMs?
Why, when it seems there should be other options, are we left with "accept absolutely everything that the DM happens to fancy, or nuke the game from orbit"?
There's no special protection. But as a DM why should I allow any behavior even if it destroys the enjoyment of the game for me?
Everyone has limits whether they admit them or not. If I'm playing a druid that shapeshifts into a monkey, I can't imagine any group putting up with my extreme roleplaying as I jump up on the table and start throwing feces at fellow players. Hopefully the extreme roleplaying example won't happen in the first place but if it did I can rest pretty safe knowing that the perpetrator wouldn't be part of the group any longer. I've been in games where there was truly disturbing and graphic imagery shared by one of the players and the DM didn't stop it. It was the last time I played with that group.
If a game isn't for me, I'm not going to play any more. If I'm DMing I can either disallow certain behavior, which may mean a player leaves, or I can stop DMing for that group. This idea that DMs should allow any behavior at their table is just foreign to me. It's also BS. Everybody has limits.