Ideas are expressed by people. Does every person deserve serious consideration?
However at this point "racists" organized and wound up controlling Congress, the Senate, the Presidency and the Supreme Court. The people that you'd like to ignore are currently running the place. Ignoring them might not be the best idea...
That said, few people of any political persuasion are able to engage in that exercise.
This is the main reason that election campaigns have moved on and focus much more heavily on turning out their own supporters than persuading "undecided" voters, who are a statistical nullity.