How routine this kind of dismissal has become got me thinking about all the conventions President Trump has broken in Washington — the breach he’s opened up in the unspoken manners, decorum and traditions that long governed the capital.

Or, as we nerds in D.C. like to call them, norms.

Now, there’s a case to be made that actual voters do not care all that much about our nerdy norms (see: Mr. Trump’s victory, 2016). There’s also evidence they do (see: Mr. Trump’s fallen approval rating among independent voters). The reality is, until he’s back on the ballot, we don’t really know whether Mr. Trump’s consistent flouting of The Way Things Are Done matters to most Americans.

The only thing we truly know about norms? Over his nearly 27 months in Washington, Mr. Trump has broken a whole lot of them.

Here’s an incomplete list, largely from the past few weeks, in no particular order:

Working in the White House: The White House used to be a place Washington’s climbers clambered over each other to reach. Now it’s the kind of job few want to keep. Nearly 50 officials have left the administration since Mr. Trump took office, according to a New York Times analysis, giving the president the record for both White House staff turnover and cabinet turnover. Last year, the White House even held a job fair to try and boost recruitment.

Getting fired from the White House: Getting fired by the president seems, under normal circumstances, like a bad thing. In the Trump administration, though, some have seen it as the only way out while saving your reputation. Take Ms. Nielsen, for example. Though her legacy is likely linked with the president’s policies on separating migrant families at the border, her dismissal allows her to argue that she objected internally — and lost the fight — over some of the president’s most extreme positions on immigration.