He sounds like a complete pushover. I'm sorry but if you can't handle facebook/online you might as well give up: real life is way harder than that shit.
I used to be a pushover too. As someone who didn't really have many friends, I often attempted to essentially buy myself friends in a similar fashion. Not just by sharing stuff, but by going out my way to help people (writing essays for people, doing some of their homework, lunch money, etc). It doesn't take long to realize this is not a fruitful endeavor or a healthy relationship. When you realize this, it should not be hard to remove yourself from that situation; if those people want to act nasty, so be it.
It would certainly suck to have a verbally abusive parent as a kid because you can't really control that. But you can sure as hell control your interaction with siblings and cousins. If they want to act like pieces of shit, cut them off; that doesn't mean you disrespect or demean them, it just means you move on with your life until they decide to grow the fuck up. I say that as someone who has completely severed ties with a brother and a cousin over bullshit.
