I really don't think there's any grounds on which to say that poor people are more or less racist than those that are rich. Speaking from a social psychology perspective, I wouldn't even know where to begin to test that effectively. Far to many variables. Not only do people actively try to not be racist which would taint results, but racism can be influenced by a number of different moods and can be brought about by priming. Not to mention the variability of racism in general. There's prejudice, discrimination, and stereotyping that can be applied to race, but can also be applied to a number of other things. Commonly applied to out-group bias. So I suppose the question is if you mean racism to mean any of the three previously mentioned types of racism as only applied to race, or applied to other out-groups. Also there's traditional racism and modern racism, and a range in between. Those that are angry or have low self-esteem are more likely to be overtly racist. Those that feel "safe" can be subtly racist. There's plenty of studies to confirm this, and I can cite some if anyone here wishes me to. Racism is really just the fact of the brain taking a mental "short cut" by using a schema rather than tackling the case individually, and that process then applied to race. Everyone is racist to some degree because we all rely on schemas for various reasons. Your relation to socioeconomic status is just another out-group bias type. Rather than race or culture, it's applied to social class. Same method of relying on schemas to follow a stereotype.