I witnessed that once. He "tore into" an older Navy submarine vet who questioned him at a press conference. Out and out lied, and in a demeaning manner. And that's putting in nicely. In modern-speak, he's a "virtue signaling jerk!"
I can see that. You figure he would be somewhat collegial with a sub vet, having something in common, supposedly.
I had to serve in the USN while he was President, and boy, did I ever envy the guys who got to serve under Reagan...