The people of Louisiana think that black people are prone to being stupid and evil and disgusting, so they don't want their children to be around them! It is very sad but we must recognize their quaint cultural folkways. They don't separate out hair color, that's ridiculous, and also people shouldn't have blue hair.
The person on the other end of that number was specially chosen by the king to handle problems related to the VKs! Depending on what the problem is, you might get something about Auradon explained to you, or someone else might get something about the Isle explained to them, or you might get a gift that helps fix your problem, or you might get transferred to a new host family, or someone might go to jail.
When you are in jail you are alone for 23 hours a day so you have lots of time to think about what you've done wrong and how you can do better! You have access to improving literature no matter what and writing implements if you don't abuse the privilege. You will get three meals a day and all your health care taken care of, of course. You can spend one hour a day outside with the other inmates but your conversations will be monitored to make sure they will help you both become better people.
The Catholics believe that the bread and wine turn into the body and blood of Jesus, their god. (It doesn't look or taste like meat, and it isn't meat to a chemical inspection. It's only meat in a magical sense.) You're not allowed to eat the bread and wine unless you are Catholic because it desecrates them, just like normal people think murdering someone in a temple would be desecrating it.
Food in shops is not free, you have to pay for it. If someone has given you food, it is always free, and if there's a misunderstanding you can talk to Charlotte and you won't get in trouble as long as it is a sincere misunderstanding.