While I can grant that being white can provide a number of societal benefits, I would want to see a definition of "colonizer class" and even then, I'll say I imagine not "all white people" would fit into it.
I can point to some people who's ancestors weren't colonizing anything. Here's a list for Europe: Ireland, Finland, Iceland, Luxembourg, Switzerland, Slovenia, Bosnia and Herzegovina, Serbia, Kosovo, Montenegro, Czech Republic, Slovakia, Romania, Moldova, Bulgaria, Ukraine, Belarus. Lithuania, Estonia, Georgia, Azerbaijan and Armenia.
On the flip side, listing all the expansionist African nations or the ones that happily engaged in slavery and the slave trade wouldn't make "All black people" warmongers or slavers. Just because a country did something wrong in the past doesn't mean the current residents are all "insert descriptor."
While it doesn't absolve the issues of the past, blaming people who had nothing to do with the problem doesn't help either. Instead of trying to be divisive, we should work together and fixing the problems.