Depending on the basis of that opinion, this idea is actually false. Especially when said basis in founded in animus regarding particular groups of people. Now, generally speaking, in the absence of people outright speaking their point of view, figuring this out is primarily speculation. But in the presence of enough evidence, such speculation is quite a bit more than baseless. So when somebody pointing out multiple examples of art they similarly don't like, and that art seems to somehow, coincidentally, almost all include people of color? That's a hint. If someone finds the best way to express their ideas is to utilize pop cultural references founded in... extremely unsavory biases? That's evidence.
There's a particular conversation thread here about how someone may or may not be providing evidence of a point of view they may or may not actually possess. In the absence of evidence to the contrary, what is one to expect?