I think you are seeing this because of a response that some Americans, whether they truly believe it or are trolling, that the Super Bowl is bigger than the World Cup. Now clearly it isn’t and it never will be. But that isn’t stopping them from responding to that and they’re going to take shots at the NFL with every chance they get.
It also isn’t just soccer fans but other sports fans are joining in such as cricket and rugby fans. Many outside the country think our football is soft rugby even though they deviated from each other to the point that they aren’t even that similar.
Personally think it’s a waste of time on getting to expand our football for many reasons. The global community hates ads, hate the stop and start action, and hate that we actually call it football.