Hm, is that a general rule? My son is not yet in school, so I don't know what it is like these days.
Also "like pink" is different from owning the occasional pink thing. I suppose a boy who would dress exclusively in pink would stand out, and maybe the bullies would try to cut him down. Still, I suspect it is not a large scale problem - obviously I don't condone the actions of such bullies, I mean there are probably not that many boys who would prefer to dress all in pink. (I didn't research that, though - in any case everybody should be allowed to like/wear whatever they want).
I don't care if a boy would "stand out" by dressing all in pink. That's not a valid reason for children to beat up children. The problem is not the child who's standing out, the problem is the bully who wants to hurt another person.
Also "like pink" is different from owning the occasional pink thing. I suppose a boy who would dress exclusively in pink would stand out, and maybe the bullies would try to cut him down. Still, I suspect it is not a large scale problem - obviously I don't condone the actions of such bullies, I mean there are probably not that many boys who would prefer to dress all in pink. (I didn't research that, though - in any case everybody should be allowed to like/wear whatever they want).