B/c there’s absolutely no evidence to suggest that Trump has encouraged large crowds to gather other than those at his rallies, which everyone is provided a mask if they so choose, hand sanitizer, and all of which occur outside. And people attend at their free will.
I have attended small gatherings, mostly outside, where there have been plenty of Biden voters without masks. Did Trump persuade them too? In fact, at a family gathering of my wife’s family, all of whom were Biden voters, my wife and I were the only ones to wear a mask while inside, mostly b/c everyone of them was older than us.
Biden has this narrative going, but it is not proof that Democrats are more likely to wear a mask than Republicans. It’s just a theme that he is choosing to run on, that he’s been diligent about CV19 and Trump hasn’t. If Biden gets CV within the next few weeks, his candidacy will be screwed.