I haven't read through all 11 pages of posts so apologies if this was already said and discussed.
I think the reason why "Whites" are considered racist is many people consider them to have the advantage over other races simply by colour and ethnicity. Whether this is true or not doesn't really matter for now because that view is instilled in many. So when someone who is more fortunate due to genetics looks down on others who are not so fortunate due to genetics, it is considered racist. After all, looking up to someone isn't harmful or negative, which racism is considered as. However, the fortunate person may not be looking down on others due to their less fortunate genetics, they simply may oppose whatever it is but their actions are deemed racist. I suppose one example of this reasoning would be how in Canada, Native Americans/Aboriginals were moved to reserves which aren't known for being 5-star hotels. So when a "white" (i.e. member of the group who moved Aboriginals to the reserves) looks down on an Aboriginal for any reason, that Aboriginal may have the preconceived notion that whites are against them as they are against whites. What I'm saying is this idea that whites are racist to others may simply be a result of those people being racist to whites and any reaction from the whites that oppose, get the white person deemed racist. If the white person then calls the less fortunate person racist, that's a pretty big negative title to give especially when the person is considered to be in the way of the whites.
Before others quote this and go mad about it, I'm not a racist, these are simply my theoretical views from sociological and social psychological views.
The first thing that has to be done in any discussion is for some reason avoided in these race ones, which is defining who is of what race or, what is "white"? Who composes this "white" race? It's a very large group that encompasses many people from different origins it may not be representative. It's possible some of these people can be racist and from a given country while others aren't but since they're all lumped in one group, the whole group is deemed racist. For example, people from South Africa, Russia, Canada, Germany, England, possibly South America, etc... all can be white-skinned and thus "white" but they don't all share the same views given different upbringings.