People very rarely associate far left weirdos with the likes of Hillary Clinton or Joe Biden or even the Democratic Party, while anyone who identifies as a Republican cannot escape constant association with White supremacists and homophobes. I don't think that necessarily means the far left is smaller than the far right or that the average Republican is more extreme than the average Democrat, though.
Maybe because the current President and public face of the GOP is a white supremacist and a homophobe?