"the villain, Snidely Whiplash, is not White but a kinda greenish color.   Does this matter? I say Yes, since these stereotypes continue to permeate Western society in myriad ways.

I can't see that prejudice against green people is that serious a problem at this time. But in any case, I'd think that when it comes to green characters, Kermit has a much higher profile than Snidely Whiplash, and surely everyone loves Kermit.