I honestly don't think there's a problem with people showing intolerance to a practice which has been shown to be a factor affecting flight safety. If somebody is driving on the wrong side of the road for example, should I accept their desire to endanger other life - I don't think so.
I think a good pilot listens to the RT and builds an 'air picture' in their head. Sure, some don't think outside their own flight deck/cockpit but that's never going to change. Mixed languages doesn't help that practice.
Everybody is entitled to an opinion. Telling Carrier not to fly is a little harsh though.