I’d say that the underlying hate has actually gone down slightly over time (which I will explain in the next paragraph), but that what Trump has done is allowed people to be very open about their existing bigotry.
The reason I feel comfortable saying that the hate has decreased is that, for example, we tore down quite a few confederate monuments recently, and honestly, it wasn’t all that long ago that the monuments were erected, long after the Civil War ended. Many of those monuments were erected in the mid to late 1900s as a way of saying “fuck you” to minorities while pretending it was about heritage.
I actually think that Hollywood and the TV industry helped quite a bit with their focus on including people of many races in the media we consume. I seem to recall that there were studies that showed children who grew up watching various races interacting normally on television tended to be less racist.
It’s sometimes called red fascism.