The unfunnyness and homophobia of the joke aside, this kind of joke doesn’t expect people to actually believe that statistics work this way. Part of the joke is the ridiculousness of expecting statistics to work that way. While there may indeed be some people so stupid/ignorant that they DO expect statistics to work this way, that’s not really the way this kind of humor is meant to work.
The unfunnyness and homophobia of the joke aside, this kind of joke doesn’t expect people to actually believe that statistics work this way. Part of the joke is the ridiculousness of expecting statistics to work that way. While there may indeed be some people so stupid/ignorant that they DO expect statistics to work this way, that’s not really the way this kind of humor is meant to work.