What's the difference between 9/11 and a cow? You stop milking a cow after 10 years.
Why are you bringing up the subject of 911?
Because I hate America and I am a Mexican. So that's why I wish so many disasters to them. Sorry bro, I was kidding. I just wanted to see what you will say about it.
Even so, you shouldn't bring up such a grisly subject. There are still many people suffering from the tragic event and to joke about it so casually brings your character into question. What if something tragic happened to you and people made a joke about it?