The idea of respecting the political beliefs of others only goes so far, and should end long before you get to the point of supporting the oppression and murder of minorities.
In the context of the USA's political landscape, saying that everyone should respect the political views of the opposing party only serves to legitimize the views of actual fascists, who say shit like this so they can play victim.
the ideologies and the people supporting them are inextricably tied. Respecting the individuals who support an ideology inherently means respecting that ideology, and the ideology won't simply go away without dealing with the individuals who support it.