1. people are idiots
2. we have a ton of right wing idiots and American politics is so loud that they get really into it.

Our right wing is mostly about billionaires and corporate theft, with only the minor parties doing the racist schtick. So the racists tend to be Maga despite it not being all that relevant to our politics. Although Pauline Hanson's one nation is getting bigger since the liberals have fallen out of favour and she's good at racism.