[devb0x]

back your self up with well written code, committed into a VCS with proper comments. For each one that is rewritten mark those commits somewhere in a list of notes. Discuss each one with him if his check in comment is not clear as to why. When he's right, leave it, when he's being a jerk note it. If all else fails you have documented your reasons. Then go and find a new gig cuz you've done all you can.