In the larp system I play in there some stereotypes heavily in-grained into the player base. For instance, goblins are squeaky-voiced hyperactive and (often) violent humanoids.
These sort of stereotypes are strongly impressioned on the players. There are 'weak variations', such as Rock Goblins, but these are essentially Goblins with one or two minor additions.
How can I safely break these stereotypes to add more flavour to the world? I want to gently introduce these changes when I run a game, but I'm worried that this won't be received well.
How do I safely break stereotypes in my games?