They are as legitimate as saying that furries are real animals. It's play time for people suffering from delusions. I have no problem at all with them exercising their delusions in private but such persons have no authority to be dictating to the world under what form of their fascist vision others must be living, because they are intrinsically delusional and hence unsuited to be determining public policy.

Yeah that's not really up to you, whether or not knights exist. If a government has something called a "knighthood", then they exist, full stop.

How many muslims and jews has he brutally murdered based only on their beliefs? If it's none he's not a very good Knight, is he?

He's not a real Knight because he's not a cruel and depraved psychopath working for the Royal Government to exterminate hated minorities in the pursuit of white supremacy.

That he feels hey OK associating himself and claiming as his own identity the historical racist abomination of knighthood though is exceptionally problematic. Something not right in the head.