Well, speaking from my own experience: I was an "early bloomer" in that I developed pubic hair a lot earlier than most boys in my grade did. So I suspect a lot of them were jealous of me, despite the fact that I was (again, irrationally) worried that my development of pubic hair might cause other boys to view me as a "freak"; but, even though they still viewed me as a dork and a loser due to my behavioral and aptitudinal differences from them, I barely ever got harassed when we were taking group showers. In my experience, in hindsight, my fear (about getting assault in the showers) ended up being unwarranted and probably unfounded.

In fact (and I didn't want my article to run any longer, which is why I didn't elaborate on it), I think I may have even begrudgingly gained some respect from the boys who otherwise disliked me...because they had probably assumed I would ask for "special treatment" and end up getting excused from communal showering.