Would you recommend that a kid that is being completely ignored also walk up to somebody and hit them in the face?

There's a big difference between responding to physical bullying with force, and responding to people ignoring you and not allowing you to sit with them with violence.

At the end of the day, as unfair as it is, you're going to be the one that looks like the bully.

Edit: I'm being down-voted... but the app is meant to be a reaction to social/psychological bullying and not violence. Violence isn't appropriate here.