I got a warning and the lack of communication is unacceptable.

[NekoMataMata]

Best option: Don't talk to anyone outside of your FC and trusted friends.

This games lack of communication on issues is terrible, and stems from the JP mentality that you MAY work out who reported you and go harass them.

Game is filled with Snowflakes and they CAN and WILL report you for doing ANYTHING.

Yeah, because Square certainly seems to care a lot about people getting harassed.

I've watched someone in DF sit there threatening to hunt down and attempt to murder someone over in-game issues and I know that person isn't banned.

It's more than likely that Square just sucks at doing anything meaningful. It's super easy to give out a warning for something small because no context is necessary. Plus, I've heard that Japanese legal systems are absolutely crooked to the point where if you're even suspected of doing anything then you're likely going to get punished for it regardless(not sure how true this is, but if it's true, then Square probably carries that over into the game).