Trump is already trying to extend anti-diversity mandates to French companies that supply the US government, and at some point soon it's going to hit Canadian companies. There's a very real chance that in certain cases, complying with his demands would violate Canadian human rights laws.
It's time for companies to start picking sides - will you comply with the laws of the country you're in, or will you voluntarily let Canada become the 51st state?
True, but so is invading someone's home.
Which just means mass protests aren't big enough. It'll take a while, but eventually they'll realize that with enough mass mobilization missing work and going into debt become irrelevant.
Unlike a lot of other countries where there's been mass mobilization, there's little recent memory of serious government oppression. Americans have generally had it pretty good when it comes to civil liberties over the last half century or so. They assume they can trust institutions like the courts to do the work of protecting democracy. So most people don't realize how much worse things will get if they don't actively resist now.
Fucking around with the military is incredibly dangerous for both Trump and the country. This is an administration that (a) openly disregards service members (to the point of sending them into battle after publishing the war plans), and (b) directly disobeys court orders.
That's a pretty volatile combination. Soldiers are required to refuse illegal orders. What happens when Trump gives orders that clearly violate a direct court order? Will the entire military really make the same decision to comply or refuse? What happens when individual units come to different conclusions?
It may just be about dress codes for now, but Trump's way of governing, when applied to the military, is a recipe for actual civil war.