Video in question:

https://www.youtube.com/watch?v=Cj5XriNtuBc

Political opinions are not a protected class under American law. IANAL, but suing seems a non-starter, as in, any given judge would refuse to hear the case.

Yes, even a judge siding with Dershowitz would see where the case was going. Yes, judges toss bullshit cases every day, and most lawyers won't take them on. You only hear about the crazy shit, because it's crazy.