While your point about racism is kind of tautologically true from a purely semantic standpoint (in the same way that "primate" is a more widely applicable term

While your point about racism is kind of tautologically true from a purely semantic standpoint (in the same way that "primate" is a more widely applicable term than "human"), race and class are inextricably linked in the US, and the problems caused by it deserve focus on their racial context. If you're using "class" as a synonym for "concerned specifically with the divide between poverty and not-poverty", then this is especially relevant. Colorblindness in anti-poverty solutions has been historically a way to aggravate problems problems caused by systemic racism that is not addressed (like Federal housing loan guarantees to jump-start an American Middle Class that "just happen" to only be available to people who meet a particular set of characteristics that "just happen" to correlate strongly with whiteness). If you're speaking specifically about objections to how loaded the term "racism" is when speaking to people, thanks to an inability of our broader society to produce a distinction between individually non-complicit, systemically racist outcomes and individually complicit, "racist intent", then I would suggest moving the burden of the term to "classist" is a form of euphemism, and will generally only serve to make the word "classist" take the same emotional connotations in the future rather than solve the terminology problem it is presented to solve. We are probably better just trying to find a way to grapple with why the term "racist" makes us so emotionally charged than avoiding the subject.