A few companies are learning the hard way that America is just not quite ready for 9/11 to be a marketing opportunity yet. Yesterday, a golf course in Wisconsin got in trouble for their “9 holes for $9.11” deal, which is pretty bad, but at least they’re not a global brand with a worldwide marketing reach. AT&T is, and a picture they posted on their social media feed today was only up for an hour before outrage prompted them to remove it with an apology. So, maybe the lesson here is that 9/11 is not a marketing opportunity. Sort of surprising that’s a lesson that we need to learn but, well, it’s one AT&T (and the Marriott) need to learn …