I just commented on another site that simply because this reporter remembers Trump....it would be a stretch to assume that Trump remembers the reporter. The celebrity, the candidate, the football coach, whatever....they don’t always remember the reporters, but the reporters remember them.
Thus I believe Trump in this situation...just like I believed Rush when he said he was not mocking Fox. It just makes common sense. Trump would not be mocking someone he doesn’t even remember.
As someone who has occasionally met famous people two or three times - sometimes within the space of a month - they DO NOT remember casual conversations with virtual strangers. That always disappoints fans. I’ve seen fans turn on actors because the actor had no recollection of meeting the fan prior. People are downright silly sometimes!
I'd find that easier to accept at face value if we weren't talking about someone who habitually takes to ranting on the airwaves and Twitter at any perceived slight. Trump knows who the guy is, IMO.