For some time I had been going on and checking posts on the r/ThePrimordialOne subreddit, and I saw a lot of hatred torwards Fontaine and its people.
Which is most likely because of the whole going up against fate thing, considering that some of the people on that subreddit, like any other subreddit dedicated to a certain faction in genshin, could become toxic anything that opposses the faction they support, and pretty much agenda driven.
Some of the points they bring up against Fontaine, is not something they tend to dive deeper into.
Like the racism against the melusines, which wasn't properly explained in game either, but I'm pretty sure that the racism stemed from the melusines coming from an abyssal dragon that could've destroyed fontaine if it wasn't killed, and even tho it was killed it still tained the waters of fontaine.
The oceanids wanting to become human, which is something we were never really given a reason why. An argument I saw brought up against wanting to become humans, is that they can just shapeshit into humans, which is true they can just take on a human form, but there's a difference between needing and not needing to be constantly near a pure water source. In my opinion critisizing that deisre should be put on a break until we find out the reason behind it.
Focalors' plan didn't managed to rebel against fate. This one is tricky because we don't know if Focalors was working against the modern version of the prophecy, which was told by Vedrfolnir or the original version, which we don't know much about. Also the only contex we see her oppose the Heavenly Principles is the prophecy, in which she was trying to save her people, not attacking the heavens, not meddling with the abyss, and not causing trouble for the other nations. Unlike with the Tsaritsa, Focalors was never stated to be actively rebelling against the heavens, at most she's doing what the other archons are doing and letting the Tsaritsa do her thing.
Neuvillette is another case. Among all the CONFIRMED sovereigns, he seems to be the only one that actually grown to love humanity (and that was before he found out that fontainians are true natives to Teyvat, and closer to being dragons, than the rest of humanity). Him coming to love humanity might actually be a step torwards peace between the two sides (dragons and humanity), which would probably benefit everyone. And when it comes to nailing the nation, I made a post about it here: LINK.
When it comes to the crimerate in the nation, I don't really have anything to say against those points, other that sometimes it seems like they only see the crimes commited by those who in some way in their eyes opposes their chosen faction. I do agree that the justice system needs to be upgraded now that the prophecy had been dealt with, and something needs to be done with the crimerate too.