By now, most people should probably know that Donald Trump mocked disabled New York Times reporter Serge Koveleski during a speech Wednesday. If you have not already done so, read my colleague streiff’s write up of the incident, which sets forth the backstory pretty nicely. Also, if you have not done so, I highly recommend watching the video of the incident in question, so you can judge for yourself exactly what happened.

This is obviously pretty ugly, even for Trump. Mocking a disabled person for their disability has been universally passé since at least the 1950s, and so some of his supporters have been out on twitter over the last couple of days offering various defenses for Trump’s behavior on this video. It is important to note that Trump himself has (as far as I know) offered only this by way of “explanation” for his actions: