You questioned their competence by asking them if they are "not using Dance partner".

You questioned their ability to speak english on a data center where just about everyone speaks english.

And then you think they are the ones being toxic.

You could consider being more chill yourself and just let people play how they want. If they want to play badly in a dungeon it doesn't matter as long as you beat it. There are no enrages in most dungeons.

Most people in dungeons are new to the game and don't know how to play. They may not be interested in playing well either because most of them will just go through the story and then quit. If they want advice they will either ask for it or lookup a class guide.

You can't use dance partner before level 60.