Is asking a tank to use his enmity+ buff rude?

[Viridiana]

That might be. But trying to convince someone who doesn't want to be convinced is just going to make things worse.

When using the duty finder, you need to be prepared for this and accept that you are not always going to be playing with people who you agree with.

Except I've almost always been successful teaching people how to play better. Not always, but almost always. The ones that don't listen I disregard and carry on. . .