They meant "it is not [JFK signage]" which is a pedantic attempt to deflect because they either have nothing to add or think it's fine and rather not defend it

They meant "it is not [JFK signage]" which is a pedantic attempt to deflect because they either have nothing to add or think it's fine and rather not defend it directly. The profile image is specifically related to JFK by image (which he sought and chose)...making it intentionally confusing or casually confusing because he rather use a clip of an image from a site dedicated to JFK airport, rather than make up his own MSpaint image. Indefensible is the correct term, if-and-only-if Twitter has decided that monikers don't mean anything unless they do. There have been similar fights in naming Guilds in WoW, AOL usernames, etc. It's to be expected and acting surprised is just noise.