Maybe we should all take a moment to feel a little sorry for Donald Trump, who reacted to criticism on Thursday by tweeting a stream of coarse insults at the television journalist Mika Brzezinski.

After all, he so clearly lacks the toughness of George Washington, who once privately observed that his critics’ “arrows … never can reach the most vulnerable part of me.” He lacks the confidence of Dwight Eisenhower, who said, when asked if he thought his press coverage was fair, “Well, when you come down to it, I don’t see what a reporter could do much to a president, do you?”

And — are we really about to write this sentence? — Mr. Trump lacks the grace Richard Nixon showed, at least in public. At the height of Watergate in late 1973, Mr. Nixon blurted at a news conference, “I have never heard or seen such outrageous, vicious, distorted reporting in 27 years of public life.” Yet he added, “I am not blaming anybody for that. Perhaps what happened is that what we did brought it about.”

Mr. Trump may be a more tender soul, or less resilient. In any case, he can’t seem to take the heat.