Someone can do a video on you, in which they denergrate, slam and libel you, but if you dare to comment on that video, as you are entitled to do under Fairuse laws, certain liars, cheaters and losers will still call foul, and run to the pervebial headmaster, (namely YouTube Copyright Strike department and Sussex Police.)
This is the downside of dealing with liars, cheaters and losers. They will always resort to lying and cheating to beat you, because that is the only way a loser can beat a winner.
They have no alternative but to lie and cheat.

