Mainly because Chris reminds him of himself.The only thing he’s said about to my knowledge is that he knows it exists and doesn’t want to review because he doesn’t want to think about Chris Chan.
Lewis has one motivation in life, and that is to be famous. Not rich and famous, just famous. He does trends to fame like young adult novels(eragon), webcomics(penny arcade), and finally internet reviews(avgn, Doug walker).
He sort of got himself pigeonholed into this role by being stuck in it while the bridges collapsed around himself. He has a near useless degree(his professional orbiter and latza fesworks has a more useless degree), no job experience, and diminishing fame.
I would feel sorry for him, but then I remmeber how smug and condescending he was to everyone he stepped on.