When you say “resist”, you are resisting half of your fellow Americans. Trump’s personality aside, half of American voters want his policies — on immigration and many other issues.
It is ironic and hypocritical, that Trump got so much flack for not stating that he would “accept the outcome of the election”, and now Democrats won’t accept it: saying “resist” is a statement of rejection of the person who was voted into office by our system.
I did not vote for Trump, but I could not vote for Hillary either; but many Americans clearly do want these policies. And they are not all fascists, and they are not all racists — or any of the other unfair labels that have been pinned on anyone who supports Trump’s policies.
Thus, the “broad based support” you claim for the “resistance” is really just those who lost the election.