DT's "victory" has encouraged a lot of folks to feel like they can speak their mind freely. For many, the "victory" is a symbol. It says "you are not alone." It's not that there's any more of them than there were last year; now they feel like they're on the right side of things and are feeling confident.
In hindsight, I observed the same thing with Obama's two terms. A lot of talk about rape culture, safe spaces, etc. Everyone who didn't agree was out of step with where America was really going and was gonna be left behind. So they thought...
That side felt really emboldened and overplayed their cultural hands. Now it's the right's turn to over estimate how much everyone agrees with them.