I know what you think the title of this may suggest, but I want you to know that I'm not trying to put Sylvia down in any way for not being his friend.
Here's what I think. Sylvia was such a sweet girl. I know that when I was her age, I had all kinds of friends and I cared about all of them, no matter what they looked like. If Sylvia had the chance to get to know Ricky and become his friend, I'm sure that Ricky would never hurt her. I don't think Sylvia was the kind of girl who would treat people badly for being geeky. I imagine her helping people that are disabled and not caring about what they look like, especially since her sister, whom she loved, was disabled from polio.