Stereotype(s) means what you expect of some specific people.
Like some Americans think British people have messed up teeth and are VERY POSH whereas we British find American stereotypes as fat and lazy (More likely rednecks) gays with there collar up and their shirts unbuttoned
Redneck conversation about 'gay' stereotypes
Guy 1: Hey you see that guy?
Guy 2: Yeah! He's one of them quero-sexuals (gays)
Guy 1: Naww he's one of those 'ere British people
Guy 2: Naw they ain't gay.
Guy 1: 'ere hold my bear *Holds beer*
Guy 1 beats the crap out of the walking stranger