Even though he comes off harsh most of the time, I think he's more on the right track diet-wise. A high protein/high fat/low carb diet is what go me in my trouble. Been reading how a lot of experienced vegetarians said their #1 one problem with their veggie diet was eating too much fat and oils. My digestion has definitely felt less sluggish after reducing my fat intake and cutting out nut butters and oils.
Maybe he does have some issues that makes him too aggressive in his approach. Ever thought about trying to work with him on that via PM instead of meeting fists with fists? After all, everyone who posts here does so because they have a problem.