How Frumteens Causes Family Problems

Here's a post on Frumteens which gives a taste of the frightening problems that Frumteens can cause:

I also disagree with the moderator in a lot of ways hashkafa-wise. But as a read what he says, it makes more and more sense, and instead of thinking "That's what those frumies think", I now think "That's how I should be thinking". I still don't completely agree with a lot of what he says, mainly because I come from a modern orthodox family, I am starting to see his way as right and my family's way as wrong.

It's great to try to inspire teenagers to a greater level of observance and to more noble hashkafos. But the emphasis on Frumteens is on how other hashkafos are wrong. That's not something to do with teens. It's a recipe for disasters with their families and their teaches.
Turning teens against their families and teachers is a very, very bad way to do kiruv.