If you're looking for non-biased server, keep moving
The owner of the server got my Discord account deleted when he full well knows that there are other underage people in his Discord server and he doesn't do anything about them but goes against me, if you want a nice server where everything is not biased, you have to keep looking.
While I do not know the full story, it was perfectly acceptable to get your Discord account banned, as being under the age of 13 is against their TOS. If there really are other underage people on Discord, I would advise reporting them so their accounts are banned as well. Maybe you only think that other people know they are underage. If they were known to be underage, I would think someone would do something about it.
Next time, just wait until you are of the correct age before making a Discord account.