Don't worry about it. You have to understand that many many new people come here every week, and they all ask this exact question.
Imagine you are walking down the street, and someone comes past you and wishes you a good morning. You say GOOD MORNING back to them ... how very nice.
Now imagine, there is a long line of people coming toward you on the street, and every single one of them says GOOD MORNING to you, one after the other, in a never-ending parade. After a while you stop saying GOOD MORNING and start telling them to shut the hell up.
You didn't do anything wrong, you just didn't understand that 5000 people asked your question just before you did.