Class and race intertwine. So does gender, incidentally. We call that multiple marginality.
So a poor white person experiences discrimination differently from a poor black person.
A poor white women experiences disadvantages differently than poor black males.
Radical feminists argued that poor, black, homosexual females simultaneously experience four layers of discrimination.
Education funding from the government is class based. There's a lot of problems with leaving the analyis at the class level, however, but that's a good start and it's not inaccurate to discuss class issues. Usually, people who attempt to do so are accused of engaging in class warfare. I would not be "simply" talking classism if you'd understand the concept of institutional racism. I hope you go back and re-read my posts or perhaps look somewhere else for a more elaborate definition. I'm not sure how you take my historical examples of
de jure segregation giving rise to
de facto segregation and distill them into "classism." If there was a historical legal context of preventing white minorities from educating their children, owning homes, and voting thereby preventing them from building economic, political, and social capital, then you'd have a stronger argument.
If you're actually interested in this stuff, there's a canon of discrimination literature available for the asking. If you don't have a certain amount of the literature under your belt, then people who know about it aren't likely to take your views on it with much weight. I'm not talking about here in this context, we're just forum avatars bouncing ideas around. I mean if you encounter someone who wants to have a serious discussion in real life...or maybe if you're curious and want to base your opinions on more than speculation and a collection of anecdotes.
You might be interested to start at the beginning:
I'd suggest reading some stuff from Omi & Winant
http://en.wikipedia.org/wiki/Howard_Winant
Here's something I thought you might find interesting:
http://www.essortment.com/all/analysesrace_rspo.htm
(I read it...I found it while googling for links to stuff I knew about to link for you. So if you agree or disagree with portions of it, let me know and we can take it from there; don't just assume I agree with everything I'm posting for you to consume or that everything is coming from a radical leftist perspective)
You could also check out some writing about world systems theory.
http://en.wikipedia.org/wiki/Immanuel_Wallerstein
I'm trying to remember two other theorists that you might enjoy reading. Well, one you would enjoy, the other you would just have to endure because he's dry as shit.
It's probably also important to note that the critical race theory started out as a critique of liberalism. It's not like all these people are coming from the left. Much of the project was to argue that the leftists could not speak for the racially oppressed since they represented the views of the dominant racial paradigm. As an example that you might understand, some of the harshest critiques of white feminists were from black feminists not from conservatives. It's like building blocks, it's not really going to be profitable to try and glean anything from just one block.