Being a boy who is into a cartoon based around pastel-colored ponies written to "help little girls build self-esteem" is weird, but I would guess for most it's a phase they'll grow out of.
Now, being an adult man into it is an entirely different ballgame.
I’d say all the hype/drama created over this will make it harder for the phase to pass. The kid might feel obligated to carry it since everyone made such a big deal out of it.