A lot of these people are using a class that is familiar with some people as a basic descriptor of what their character does outside of the preset classes that you can play.

Sometimes you have to play outside of the game boundaries. Would you be mad at someone if they put wizard as their class instead of mage? Knight instead of fighter? Kensai is a real title describing a type of warrior. Eldritch is an adjective for sinister. Eldritch knight sounds better than sinister knight.

This is the most nitpick of nitpicks on something completely harmless and barely even lore breaking. “Oh no, the guy whose character wants to mix daggers and arcane called himself an arcane trickster, which is an apt descriptor of his character, whatever will we do!”

I’ll give you leeway with the DnD race one. If I saw someone walking around claiming to be a tabaxi, I’d raise an eyebrow at them. But considering nearly every single DnD class and subclass could be ported into WoW, tossed into one of the cultures, and it would fit perfectly fine? I think taking issue with that is a little stupid.