Yet it's pretty consistent that games which revolve around esports have extremely toxic communities. To call everything she's said a lie when most people have the same experiences, is pretty disingenuous. As a WoW refugee myself, one of the biggest black marks on the game has always been the community, for many of the reasons she's listed.
If there is a sizable number of players coming here from WoW, you should be concerned. That doesn't mean we're all bad- nothing of the sort- but even just being here two months, I don't think I've had a single two month period where I've been treated this well by pugs in 15 years of playing WoW.
There's a big difference between being concerned, and being hostile- I think if I'd give advice to FFXIV players it'd be to keep doing what you're doing, kill them with kindness so to speak. Most people in general will try to change their behaviour to fit in; and those that don't stand out. Ideally, the WoW exodus will assimilate.
The absolute worst thing that can happen though is for toxic esport style behaviour to be permitted. If people are insulting teammates or trying to ruin someone else's enjoyment- report it. And that also means SE needs to do their part. Blizzard doesn't do this- just play Heroes of the Storm for a month or two and you'll see; constant games with AFKers, feeders, nastiness because they decided not to do anything about it, and the game utterly collapsed as a result.