LONDON — On the day that Prime Minister Theresa May presented her draft plan for Britain’s exit from the European Union, also known as Brexit, worries about the country’s future spiked across the land and a fellow Conservative politician stood up in Parliament and suggested it was time for a no-confidence vote against her.

The next day, a hashtag began trending on Twitter — #CurseReesMogg — as Britons took out their anger not on Mrs. May, but on the politician, Jacob Rees-Mogg, a hard-line Brexiter once called the “Honorable member for the 18th century” because of his perceived antediluvian ways.

The tweets were various shades of rude, crude and obscene (therefore unprintable here). They were often distinctly British, touching on Mr. Rees-Mogg’s posh accent, his upper-class background and his “nanny,” to name a few themes.

We read many of them so you don’t have to. Here’s why #CurseReesMogg has been trending since Friday.