While I agree with you 100% OP, you still have to understand that you're running content where such optimization is not only not required, it can be outright shunned in many groups. This doesn't mean that you should change up your playstyle to appease others, or to say that anyone is right or wrong in this situation. What I do want to say is that you still do have a choice. You don't have to roll with these kind of players if you don't want to, and you can abandon the duty. I know you're venting, and it totally sucks to be grouped with players of an opposing mindset, but I feel taking the penalty to be a lesser punishment than dealing with strong adversity for any longer than a couple of minutes. If you are the kind of player that does a lot of other things, then I strongly recommend this if it does happen again in the future.