Sorry to say... the "friendly" or "nice" cockerels is more often than not a misunderstanding... they are actually confident... and learning that you or people are not a threat... which means they will (most likely) eventually decide that you are part of the harem to be controlled. They don't fear (in the chicken world this means RESPECT) you at all. Once hormones kick in... ALL bets are OFF... They only care about mating and NOT about being friends.
My personal experience says that bird needs to go to a home with plenty of cockerel/rooster experience and no kids OR freezer camp.
The first time I was told by
@Mrs. K that the friendly boy was the one who would need to be processed first, I was shocked... BUT she was RIGHT! And after several months of being attacked from behind and relentlessly crowed AT, it was a relief to have him gone.
Of course every bird and situation will be unique. I would start by going hands off... no lap sitting, make sure to walk THROUGH him and NOT around him. Start teaching him some respect.