Here's the deal with Hispanic-Americans - when white people choose to call attention to their heritage in such dismissive comments, there is literally only one reason ever why they do that: because they're racist. That's it. The whole deal about America is that, supposedly, even if we're hyphenated-Americans, we're meant to treat one another as basically being the same (not that this doesn't have its own pitfalls - ie. the fallacy of "I don't see race"), so if and when any white American woman starts commenting on how big a Hispanic-American woman's ass is (since we have stereotypes aplenty in America about Latina booty), or starts using Spanish-language terms to taunt her, the ONLY possible reason that she would ever choose to do so is if she wants to send the message, "You are not white, and therefore, you are lesser than me."