I just say to each his own, man. If the other guy is insistent, I ask him about his own hobbies or interests and pester him about the wisdom of having such. Like I would attack his fondness for flashy clothes or eating at fine dining restaurants, etc. When he goes on the defensive I tell him that I have just illustrated my point, which is:
Bottomline, it's all subjective, so we don't really have to explain ourselves to anyone.
So long as what I do is neither illegal, immoral, nor violative of others' rights, it's my choice to make, and mine alone.