>>4 Tell him you brought your shit to the mall or something and they got stolen. Big deal. You'll get yelled at for a while, but it won't be the end of the world.
And if you're not going to give him an ounce of your time, then you're avoiding him, which IS anti-social. Again, it's not that big of a deal. Either talk to him here or there or suck it up.
Though your dad sounds like a control freak, you also sound terribly self-centered and determined to be an asshole to him just because want to reinstate the fact that you're an angry teenager. The privacy issue is only one small part of what you're pissed about, right? Don't take other issues out on something so trivial.