Part of being an adult is taking your life into your own hands. This can be as simple as admitting “Hey, I’m not having fun, so I will stop engaging with this activity for now” instead of feeling an obligation to a bunch of strangers you may never see again.
Likewise, and fwiw I think toxicity is quite rare in WoW, but if it happens, leave if you’re not having fun. There is no reason to finish a dungeon if you’d be happier doing something else.
But this? is a wild take.