no rape isn't, but guess what. This is something people call a joke. see here is how it works. He portrays a scene in which the statement is going in one direction by saying i'm not the smartest, strongest etc. BUT, now wait for the joke part of it. at the last minute he takes your perception of where the statement is going. in this case most people will think he will say something long the lines of but i'm still a good guy so date me, but instead he said something you don't expect and here its rape.

so that is how jokes work, if you knew the ending it isn't funny.

i assume you didn't expect the ending to be a rape joke so therefore you didn't see it coming

if you did see that it was gonna end in a rape joke then you should probably see a doctor cause you have a bad case of tumblritus.