I know a man that was born in the early 80s, grew up in Utah, and when asked if he was teased said, "Why would I be teased about it?" with a look on his face that said it never happened. However, the reality is that some boys are teased (I know a woman online that circ'd her son because her dh was "ridiculed" throughout high school for being intact. It always bugged me when she would post on sex topics with NONE of the problems everyone else was talking about). But, I was teased about a lot of things, like having white-blonde hair, but I never wanted to change that, and that would have been easy, painless, and not permanent. I just chocked it up to people being jealous that I had such gorgeous hair and they didn't
If you teach your son to be proud of his body, of what he has that they don't, of what happened to them (and maybe a few good comebacks), then it won't be an issue. Even if he is teased, which isn't likely anyway, it won't mean that he will wish he was circ'd.