Stereotypes exist for a reason. It would be stupid to argue that every single Russian is exactly like that. But at the same time you'll find those traits exhibited in a lot of Russians at various levels of seriousness.

Being bigoted is also pretending that tribes/cultures do not share patterns and behavior. Individuals are unique, but they exist as part of a group. When you talk about the group, you necessarily need to make shortcuts and synthesize.

I'm pretty sure that when you talk about dogs, you'll attribute specific behaviors to specific races. But now it is not politically correct to think humans are the same, even though it is scientifically provable.