This is a disgrace, he's acting like a 5 year old. I get the feeling he's throwing a tantrum while writing. Instead of being patient because everything can be resolved he keeps on trolling. Everything was explained to him regarding the kyc and the banner, just like you said, but it seems it’s pointless. Problems always happen, but they can also be resolved. All he knows how to do is troll and use offensive language.
Well, some people are new in this industry and probably don't know that it is a standard procedure. If you are suspected, the casino may freeze your funds for the investigation. I assume either they are new in the casino industry and facing this kind of issue for the first time, or they know everything, but decided to continue trolling to satisfy their ego. I don't really know what else to think about them. There is nothing to be worried about if you are not an abuser. Just comply with the rules and everything is going to be fine.