The term weeb has largely lost any meaning it once had such that it's now basically just used an an insult against people who like anything made in Japan, or just made in the style of something from Japan. So, yeah, based on what a "weeb" is these days and given that FF14 is made in Japan, most people who play FF14 are weebs.

Dumb as heck? Yep, but that's the logic some people operate on.