Protest movements are a slow solution, but it's the only way to shift from a general sentiment to a movement. These early stage protests are unlikely to have much impact, but it's a way to meet others and build the core infrastructure for larger and more effective protests down the road. It doesn't make a difference overnight, it often takes decades to build enough momentum to affect change.
It's not going to stop Trump today, but this isn't going to end with him either. It's agonizingly slow and difficult, but it's not pointless and it's a hell of a lot more than sitting back and cynically doing nothing.