Everyone may be a "racist" in a trivial sense; in other words, favoring members of their own race *all other things being equal.*

That's not the same as being a "racist" in the usual sense of being knowingly discriminatory or hostile to other races.

"Racism" (like "folk music") is both a continuum and a label that's too broad to be used without context.

To say "We're all racists" and leave it at that comes close to saying nothing at all.

"Even non-bigots have unconscious racial bias" is a less dramatic but more precise and helpful statement.