Just asked a bartender in Ireland for an Irish car bomb. He came back with two shots of everclear, lit a flame on both, and said, "There's your twin towers".
That seems inconsiderate to the 9/11 victims. Would you laugh if you were personally affected?
You are a cock sucker, it's a joke, where you come from jokes aren't funny?
9/11 is a sensitive topic that is difficult to laugh about. It would be best if you could avoid any joking on the topic and find something else to find humor in.