“It’s always ok to throw out trash”

“Ok but sometimes people throw out stuff that’s not trash because they think it’s trash”

Correct, and that would be not ok because they have mis-identified trash. Doesn’t change anything about the original premise. If you throw out trash, that’s good.

DHH has expressed clear public support for white nationalist causes and figures, on multiple occasions. What else should we call him?

you should read up on DHH and then perhaps pick another example