I couldn't disagree with this more. Music snobs generally hate anything that is too popular, so i don't think they want converts, they just like to act like they are better than everyone else.
I find the opposite to be true. Most music snobs I know, we like all sorts of things, and will defend popular things as well (I'm in Call Me Maybe's corner! I think Hanson is great as well). By virtue of having listened to a lot of stuff, we know our tastes, and feel confident in our opinions.
On the flip side, mainstream music fans are the ones who feel the need to demonize those who are audophiles. Look at who lobbed the "snobs" argument, has there been an equivalent "slob" charge? In this thread, multiple times people have argued something is not good because it's not popular enough, but the "snobs" have not made the inverse argument -- that something is bad because it has lots of fans. In fact, I explicitly agreed with a rubric that included popularity in it.
I'm not saying there aren't some people out there who just want to like the most obscure thing they can, but most people grow out of being 22.