^interesting. I'm not really prepared to to call it an issue of race yet, myself. To me it's more of a "popularity breeds contempt issue": is the said subject deserving of the attention or not? You see it happen all the time with in any activity. Some examples within skating I can think of: Leticia Bufoni at one point didn't seem well accepted by her contest peers who felt that she wasn't representing females how they should be (even though she was beating them in contests), Dylan reider for some was too pretty or had fake style, sean pablo -- not good enough to deserve the attention. Furthermore, even others like SkateMoss or Beatrice Dommond's presence in skating has been in question for a lot of people.
Skating is a notoriously hard crowd to gain acceptance in, especially if a skater is compelling for whatever reason that others don't agree with. I think most skaters just want to know whether or not the objective skill matches the resulting success and reception. In this case, it's more of "is this kid really that good? or is it that he was just the token little kid that we've grown to watch over the past few years?" Skating success more seems personality driven as an important variable, as I view Kader as someone very fortunate to have been given exposure by Reynolds as a child on par with adults. I can't really think of any other "child-star" figure thats been pushed as much as he the past few years. All in all, good on Kader to follow through in his success, cause not every little kid can yield the results he has when given the baton.
There is always something that people will pick on when someones popular. Maybe race is a part of it? But I'm not really convinced the color of his skin in in the eyes of others has anything to do with it, yet. If so, there would be more glaring examples levied to skaters of color across the board -- I'm thinking Ishod, Tiago, Zion... there's so many amazing skaters of color that haven't had there success in question (not that I'm aware of). It's always a game of whose cool or not, why, and whether or not the subsequential success is deserving or not.