Joe + diminished is a funny concept. How far did he have to fall? He's the bottom rung of cable blather. The only way he could get any more ridiculous would be to get kicked off cable and run a podcast out of his mom's basement like Keith olberman.
OTOH, trump should avoid wrestling on this level. There's a dozen ways trump could point out Joe's patheticness without getting personal. And when you get personal with liberals, they're going to fall on their backs and claim victimhood with lightning speed. It's as natural as breathing for them.