Well, no, that's in fact not a dictatorship. Words mean things; you don't get to make up your own definitions.
But nonetheless, it's a baseless charge anyway.
Trump has behaved, on a personal level, abominably. He conducts himself like a bullying child. He is a wretched embarrassment.
But he has not done anything as President -- as in, using the powers of the Presidency -- outside the scope of power of modern Presidents. He has not exceeded any powers of the President as they were handed to him by his predecessor. In fact, he has walked back some of that power, by ending a number of onerous Obama EOs and regulatory reaches, and he actually pays lip service, from time time, to the idea that some of the things people want him to do are properly the role of Congress.
You may not LIKE what he's done, and I certainly haven't liked much of what he's done, but that doesn't mean he's done anything illegal or above the law. It doesn't mean he's exceeded the scope of his powers. He hasn't.