I'm an American, and I mostly agree with this. We should absolutely boycott products from red states and the gigacorps that put this nut in charge. I think a lot of people will do this anyway, since he's going to cause a recession anyway and millions of people will be in poverty.
Boycotting large American corps is the right thing to do here.
I would say though, support your local businesses as much as possible, and while that likely will buoy some seedy someone down the supply chain... well as they say, there's no ethical consumption under capitalism. Just do as much as you can to help the right people.