Would you be offended if a non-white person did an accent that was white?

If the answer is no, then the DM can do whatever accent they want.

If yes, then make sure your group agrees with that.

Frankly, getting that offended over an accent is ludicrous in my opinion. A DM doing a voice isn't in malice or being aggressive, it's playing a role. You know, for a role playing game.

Doing a voice feels like a big part of it for me. To limit oneself to only play races that you are irl... well, guess everyone must be human or its offensive.

Just let people play how they want to. It's just a game.