You'd be surprised. It's the better looking girls who you think are a pipe dream that will be more receptive to being approached. While the fat gremlins often have high ass standards.
It's a defense mechanism. Next time you're with your boys pay attention to which of them has the highest standards when it comes to conversation about women. It's more than likely the one who gets no cheeks. Why? Give off the perception that few women are worth your time and people forget you aren't getting girls because you're a swagless, unattractive virgin. Women do the same shyt. Perceived value goes a LONG way.
In fairness though, some unattractive/fat women KNOW they're unattractive and will curve men who they perceive to be out of their league because they see it as disrespect--in other words you're on a dry streak and settling for the uggo to get a quick nut. They aren't stupid, and they know that.
Don't take rejection personal.