That's absolutely true, and I've upvoted your post.
===
Relative side note. I want to point out that OP hasn't even had "experiences with most WoW players," as they claim. OP has had the same experiences most of us have had, perhaps interacting on some basic level with a few dozen different individuals, maybe on a busy day, even a hundred people. So, say fifty a day, on average.
If you did this for an entire year, at the outside and given the benefit of the doubt, you will have interacted with ~15,000 ex-WoW players. Assuming, further, that you determined who was and was not an "ex-WoW player" because most folks don't mention it. If someone is uber-awesome and the perfect group leader... you still need to ask if they're ex-WoW. No skewed data, now. Everyone you interact with has to be asked.
Anyway, doing this for a solid year, you'd end up interacting with perhaps 5% of all "ex-WoW players" that have moved to Final Fantasy, assuming the wave was 300k players moving from there to here; adjust accordingly for different estimates.
With that kind of data resolution, you can determine nothing. You can't even make an educated guess. Hell, you can't even reliably take a stab in the dark and hope to hit something.
Also, consider that each player you interact with must be briefly interviewed, so you can determine their actual demeanor, and not base assumptions off heat-of-the-moment interactions in a frustrating raid, etc. This would be a full-time job and then some. Of course - of course, right? - you would want to at least have a question-and-answer session with people you are going to label as "such-and-such," especially if "such-and-such" is something negative.
2021 Sociology: I met and interacted with four hundred people out of a group of several hundred thousand, and I am ready to declare my findings about the entire group.
Good luck with that. You're going to keep running into social issues if you go about life this way. When you make a determination about a larger group based on limited interaction with their constituent members, you end up with racism, bigotry, sexism, (sexual preference)-phobia, etc. Every single one of the preceding exists because people make baseless assumptions about groups of people made up of hundreds of millions of individuals, when they, themselves, have only interacted with twelve members of that group. The rest, they read on the Internet.
Can I really complain, though? We Americans eat this stuff up. Someone polls 1,500 people, and somehow this turns into "44% of Americans say 'yes' to this, and 56% say 'no'". And we believe this garbage. It really is a fairly serious issue in our society, all of this pre-judging asinine nonsense and polls of 0.5% of a group that are extrapolated to represent the entire group.
It frustrates me because I have no issue judging individuals individually. Is it really all that friggin' hard to judge individuals and leave groups out of it? Who cares who played what game before? Are all players of a certain game the same? Of course not. What game(s) one has played in the past matters about as much as the skin color of the player.
"Ex-WoW" indeed. My mom (rest her soul) played WoW up until she simply couldn't anymore, at about the age of 65. She was not exactly the same as the angsty teenager that rages at someone in a failed raid. I resent the insinuation that she was, to be honest, and that's exactly what one does by suggesting all "ex-WoW" players are the same.