As a further caveat to the above, the reaction from the guy doesn't surprise me. If he sues, they will likely settle out of court for a relatively small sum of money. The negative press this guy would get from such an action would be huge. I mean Buzz Aldrin is an American hero basically.
This would also ruin his image and credibility. The guy is a conspiracy theorist. If he wants anyone to ever take him seriously, he can't pull bullshit like antagnozing a good ole fashioned American hero into punching him and then suing the guy for it. I think having people believe him is probably more important to him (and potentially more profitable) than suing Buzz Aldrin and settling for some small sum of dough.