As someone in the US, I kind of hate comments like this. Not because I don't agree with you; I'd love for us to stand up to Trump, too, but the problem is, I don't know how to (effectively) do that, I don't think many others do, either, and whenever this comes up and I ask the question, 'What exactly do you want us to do?', the answer is always non-specific and weak, like "Protest!", which, I mean... cool? We have been, but it's not accomplishing much of anything. Really, I think the answer is 'We don't know, either', and everyone else is equally as frustrated as we are and, like us, don't have a better way to express it than calling for nonspecific action.
All that said, in keeping with tradition, I'll ask you: What exactly do you want us to do?
This is one of those comments that it's really easy to make from the comfort of your home on the internet, and almost impossible to put into action. I'd go so far as to say it's even more useless of a suggestion than the 'Just protest!' folks.