You can report it to a GM. The thing is, unless someone is abusive to you (i.e. shouting profanity at you in chat before they kick you, etc), then it's most likely going to get chalked up to 'differing playstyles'. As far as real world legal action, most gaming companies have a liability clause in their ToS that prevents you from suing them for something like that. There's usually pretty strict limitations on the kinds of things you can seek arbitration for.
I mean, I guess you could try but you'd basically just be throwing money at your lawyer.11.3 User Disputes. You shall be solely responsible for resolving any and all disputes that may arise between you and other Users in connection with the Game, and for paying any and all expenses incurred by you in connection with resolving such dispute. Square Enix shall not be responsible for mediating or resolving any such disputes and shall have no liability to you or to any third party for any costs, fees, expenses, damages or other losses incurred in connection with or as a result of any such disputes.
I don't really find it disturbing since we know nothing about the source. For all we know, it was just some butthurt player that got banned. Anyone can go out on the internet and post a negative review, and there's no telling what the actual truth behind it is. This community is far from the most toxic I've ever seen; we're a bunch of care bears compared to people in some of the other games I've played. PvP heavy games tend to have very toxic communities. So do games where there's a lot of class imbalance (we're getting a taste of this now, but it's not nearly as bad as it could be). FFXIV's community is actually pretty decent overall.
I don't learn well from video guides myself, but I find that they at least give me a general idea of what to look for even if everything doesn't soak in at first. I at least know what the basic mechanics are called and how they work.