This is true for both the revival and the original series, he further elaborates on this when asked on his personal blog that it applies to a good portion of his characters i.e. Johnny the Homicidal Maniac is also such a case.
However in the same post he makes the point that the race of any of his characters (excluding Zim of course) does not play into who they are as a person nor is there any temptation to have any character go around blaring it out.
In the case of someone like Wolfe who has on multiple occasions been seen to be nothing but vain on the subject matter of someone's heritage including their own, it reads as such.
Nor is it aided by the fact that they makes such statements based on their skin colour whilst the characters Dib, Gaz and their father are based on Vasquez's brother who he describes as, and i quote, ''pasty Mexicans like my brother and his so-white-looking Village of the Damned children''.