Here's the thing: resistance movements don't happen overnight except in the most extreme of circumstances, and since our transfer of power was (technically) peaceful, people aren't feeling the kind of hurt that would drive them to protest just yet.
So, people who are wise enough to see what's coming have to start small. Start with a small protest, then work your way up. Boycotts like this one are good for getting people to do something to start off. It might not do a whole lot at first, but they'll start to add up as more and more people become aware of the movement.
Eventually, more drastic action can be taken, but getting people together and proving that they have the numbers to make a difference is vital, and unless a catastrophe happens, that process takes time.
Trudeau got in front of the cameras today and spelled this out. Our government chose to take this action, and Canada is having an entirely reasonable response. Once the tarrifs end, we can go back to where we were, but in the meantime, Americans need to learn how much they rely on Canadian trade and need to understand that this is entirely our government's fault.