I would be interested in something that worked the other way around: is there a way to teach stupid, wrong, brave people timidity, without psychologically scarring them?
..... ahem
EDIT: besides the flippant humour of the remark I was trying to make a point of gender identities and social profiles when it comes to interaction. It can be surprisingly easy to pick out the "Alpha" and those more subservient or devious when watching a conversation. I wouldn't be surprised at all if speech conventions had a very strict social hierarchy attributed to meaningful measures such as confidence and deviousness.