Here are a couple brief videos of Abreu talking at a school a few years ago about how it never really bothered him when people would sometimes make fun of him about his size. There used to be other videos on youtube of Abreu talking to kids about his size and being a racer, but I can't seem to find them anymore.
I know from looking at his Facebook and Twitter pages in the past that he has visited schools many times to talk with students about bullying.
https://www.youtube.com/watch?v=KfsFBfB68QQ
https://www.youtube.com/watch?v=8f2G9VlZJHw