How often do the different Races inter-mingle with each other?

[Berethos]

It's supposedly pretty rare and frowned upon by many within Eorzea but that is very rarely shown to be the case within the game itself. I have my suspicions as to why

In other words, you've twisted the possible motivation behind the tolerance of adventurers to fit your own conspiracy theory. Mmkay.

Look, not everything is a bid to make Garlemald look bad.