Don't worry luff, as the others already mentioned, you have done nothing wrong.~
Some people can get very disrespectful, and I must say that it's quite annoying, especially in such a situation, where people randomly begin to cuss at you, for only having a bit of fun and minding your own business.
As said before, you have done nothing wrong, and luckily there exists a block button and the ability to report problems as such to staff, for if cyber bullying happens to occur.
Also can they not anyhow 'delete' your account, they are only threatening, as they don't have any good manners.