I'm more disturbed by Trump's supporters than Trump, honestly. Trump has already been president and instead of doing what history's worst dictators have done (e.g. literally imprisoning and executing members of opposition groups, imprisoning and executing minorities, waging conquest type wars, etc.), he typically would just take to Twitter and rant like any other avid Fox News watcher in a La-Z-Boy. Trump is quintessentially an entertainer and provocateur. Compared to history's most notorious dictators, he's more of an attention-seeking clown than an ambitious autocrat. He'd rather get into a highly publicized social media insult battle than start wars, conquer anything or oppress or exterminate anyone.
His supporters, on the other hand, appear to me to have a sort of zeal and attraction to authoritarianism that, if it were someone more ambitious and serious in dictatorial aims, legitimately seems cause for concern that they would enable a dictatorship that could actually get that bad.