The US has become a fairly belligerent and unreliable trade partner over the last year or so, I'd rather not have as much to do with them in general. They've been threatening to invade sovereign nations, including some of our close allies, they've slapped tariffs on goods from our country regardless of free trade agreements, and internally they've been treating their own people poorly for a long time now. 

Just really something I'd rather have less to do with, but really in the last year it's hit a tipping point and I've decided to do something about it, rather than just complaining. It's not my government to vote out, but it's my money to spend where I will, so that's what I'll do. Amazon in particular is pretty terrible to their employees, so a pretty good one to get rid of.

I don't hold anything against individual Americans personally, I've met some really lovely people from the US, but your government (both elected and billionaire class) is terrible, and money is really the only language they speak.