stereotype is just someone's opinion
I'm sure that there are people that thinks deaf ferrets are more likely to bite than ferrets who aren't deaf.
What if we were to ask deaf and hearing ferrets whether this was true or not? What will ferrets do? Maybe they'll laugh at us. Think, what?
Why do we get offended easily? Ferrets doesn't seem to care. Why should we? Just let those people have fun with their "stereotype".