I've posted a couple responses to this guy with some points I think positively prove the landings happened and I haven't heard back from him since. One of those people who claim he used to believe in them and really wishes he could but the evidence against it is too overwhelming. Anyway, thanks for the help.
One of the strangest claims I can recall is someone pointing out that the Comet airplane had it's windows redesigned after it was proven that the original shape proved to be a factor in some of the crashes it experienced. Since the LM didn't have round or elliptical windows, that was all the proof he needed that the missions were faked. I explained to him that the LM wouldn't go through anywhere near as many pressurization/depressurization cycles as an airplane. I also showed him drawings of the support structure around the LM's windows compared to the typical airplane but of course it was all irrelevant to him. The fact that one of the windows blew out during a LM test and the cause was never found over-ruled everything else as far as he was concerned.