Hi, I am an obsessed FB and Twitter narcissist, and I'm proud of it. I'm also happy about having access to the Western medicine, which, while not the only one, and not perfects, seems to be the only one that consistently works.
And you are not talking about giving them a "right". You are talking about choosing something for them -- we can contact them (which will unavoidably deeply alter their culture, and is quite dangerous) or not (and let them live uncomfortably). It's our choice, and we can't really run from it. By doing nothing we decide for them, whether we like it or not.
Oh, and your parent didn't really say that we should convert them. He said that we should give them access to our technology. And if that converts them, then possibly it's actually them who preferred our culture over their own.
I'm actually mostly on the side of avoiding contact for now -- but mostly because of health risks related to contact, not because I'm afraid for their culture. Culture is about the change, not about maintaining some snapshot of society.