Being spikey and essentially "hard" is different from being petulant, Johnson was the former but not the latter. I like aggression and physicality, I like a bit of niggle on the ground and getting under the opposition skin. To your point I think Sinckler is the opposite of an Alpha male, he can't control his temper, he's stupid and doesn't know when to rein it in and doesn't seem to actually have any respect for the officials or the game. According to other players - including club mate Marler - he is also a faux hard man and can't actually back it up. Personally, I find that irritating and an unwelcome move towards an almost football-esque attitude. Keep the niggle and hostility, lose the stupidity and disrespect of the game.