Unless it stretches suspension of disbelief... you're already coping very well with people shooting energy beams out of their hands, y'all. Do you really draw the line at them also being Asian?
I know it is rhetorical, but it shouldn't surprise anyone that some people are this shallow. Race/gender identity is a big, complex thing, but the answer is definitely - yes. That's over the line for a lot of people. And by a huge margin. Many people want their heroes to look a certain way otherwise they can't (or don't want to) relate to them.
Spiderman, Captain America, Thor. Just a few other examples people have been up in arms about recently. There are a ton more.
It is a big theme in Falcon and Winter Soldier, which I thought was very good, and something that was begging to be addressed. I'm glad it was not ignored.