She's not wrong - Raiders make up a minority of the player base, especially outside JP.
I did a bit of a dive into the recent Lucky Bancho data and ordered it by normalised raid clear rates:
At best, a fifth of active level 90 characters have cleared the current Savage tier. And that's JP, on Chocobo - JP raiders run many alts to do "merc" runs, it's a big part of raiding on JP, so that's probably not a fifth of all players, just of all level 90 characters.
Outside of JP it's even worse - Under 10% of level 90 characters clear Savage.
The majority of this game's player base are honestly terrible - They can often barely clear dungeons, let alone trials or raids. The difficulty of jobs is geared around ensuring that these players are able to clear "normal" content even if they sit there with their thumb up their arse and cast one spell every other GCD. Raiders check out of the game after a little while generally, I'm certainly down to raidlogging as I mentioned above, and my static is all pretty much the same - Log on once a week to do Savage, and once or twice for FC events where I drag them through Thaleia or something.