"Delete your account" is a pretty standard joke tweet, especially in political and media Twitter (which both the people writing "Hillary Clinton"'s tweets, and the people reading them in the middle of a Thursday afternoon, are likely to be familiar with). But this is a well-executed iteration of it.

You don't tweet "delete your account" in response to an outrageous or offensive tweet, because it's not a serious demand. So many of the things that Trump tweets (or retweets) wouldn't be appropriate targets. Rather, "delete your account" is used when someone has tried to be funny on Twitter — for example, by attempting to land a sick burn — and failed.

That's a pretty good description of Trump's tweet. "Crooked Hillary" was never his best nickname, and it's not enough to carry a whole tweet. And the "nobody else does" joke, while it plays okay to his base, isn't his strongest material — Obama is a pretty popular president, and way more people hate Clinton than hate Obama.

The other reason this is funny, of course, is that it might actually be a good idea for Donald Trump to delete his Twitter account.