I'm not offended when I see a white cowboy.
You might be though if the only time a white guy showed up in a movie was when the movie needed a cowboy...
It's a fine line Disney is trying to walk - you don't want to take away minority roles... but at the same time they have to be careful with stereotypes. This 'wise old master' one is a good one. Do you go "Mr. Miyagi" and cast to type or do you do something different? Either way some segment is going to be upset in today's outrage culture.
I really like the way Marvel is doing things - you nail the look of the main guy (Thor, IM, Strange, Cap, etc) and then you play a bit with the smaller roles to make the movie world look more like today's real world and less like 60s' comic book world. That was kind of one of the very few things that Man of Steel got right with Fishburn/Perry White I thought.