You just can’t go willy-nilly.”<br />People who have had their messages shared from the Trump Regrets account have quickly been pulled into debates with people who reject Mr. Trump’s policies,<br />and tend to get a deluge of criticism after their tweets are shared by the account.<br />In an interview, Mr. Watson, 40, said he was never wild about Mr. Trump — “I really thought he was going to fizzle out<br />and drop out” — and now regrets his decision to vote for him “as the lesser of two evils” after watching some of the decisions he’s made early in his presidency.<br />“I learned that the population is a lot more diverse than I expected.”<br />Jon A. Krosnick, a professor at Stanford University who studies the psychology of voting, said<br />that he was struck by how many of the Trump Regrets messages seemed to focus on Mr. Trump’s brash leadership style over his policies.<br />“I voted for you but you’re still acting like a baby,” one supporter from North Carolina wrote on Sunday, the same day Mr. Trump insulted the billionaire Mark Cuban by saying<br />that he was ‘‘not smart enough to run for president.’’<br />“When are you going to act Presidential??<br />Ms. Nelson reluctantly voted for Mr. Trump — “because of Hillary’s lies” —<br />but grew disillusioned with Mr. Trump’s behavior, which she thought would change after the election.<br />And, contrary to the name of the Trump Regrets account, not everyone who has lodged a complaint regrets voting for Mr. Trump.