This is the first time I heard about this being a thing that FFXIV is known for, and I have been playing for several years.
Also all your fc related problems are things I encountered in every multiplayer game I have played. There are insular and meanspirited people everywhere. Those who find a good community right away are actually in the minority. Most people have to try a few times before they find a group that makes them feel accepted and happy. I actually ended up making my own fc because I couldn't find that group.