The Coast Guard gets mocked in the show Space Force.

He is right that Biden messed up the line when trying to plagiarize it, but he was wrong when he said that it wasn't a joke. It was intended by the Coast Guard as a good-natured jab at the Navy in the perpetual competition and ribbing that goes back and forth between members of the different branches of the U.S. military. The Coast Guard members got the point and laughed when President Reagan said it as a quote from the commander of the Coast Guard. I suspect that, despite Biden's messing it up, they knew what he meant, but they just don't like him.