Attributing somebody specific stereotypic behavior based solely on color of their skin (implying race) is the very definition of racist. Of course, if you talk about specific individual's behavior pointing it out is not racist. But if you say that individual is doing so because he belongs to a certain race and you would expect the same behavior from any representative of the same race because their race defines their behavior - yes, this would be textbook racism.

was "racist behavior pointed out"?

In the article under discussion, yes.

He was talking about the specific post under discussion (which was flagged and is no longer visible).