Anybody hear stories about him when he was younger?
I heard he was a bully at the acting studio he went to when he was younger.
I hope its not true.
Does it mean that you will believe and take anything at face value just because you feel that it fits to a perceived ''profile''? And what is a ''profile'' in this context exactly?
I think that it is safe to say that we do not know anything about the personalities of the celebrities/actors we generally discuss here. Rumors are just that, rumors which are often amplified according to perceived reputation. So if an actor has a reputation for being difficult, the (tabloid/gossip) press is likely to fabricate and amplify rumors of possible feuds. It is as simple as that.
That said, if your suggestion that Hardy was/is a bully is supported only by some sub-tabloid speculations about feuding with Harry Styles, then it is likely to not mean much.