As someone who voted blue, part of my motivation to not do it on election day was to avoid being harassed by Trump's poll ~~watchers~~ intimidators.

I can't say whether the conclusion you've drawn from the maps is right or wrong. But I can say that the analysis is probably incomplete. Because does that pattern hold out in other elections too?

How are states with mail in voting counted? We don’t vote at a polling station (and it’s glorious) on Election Day. We typically vote well before hand. They just get counted on Election Day.