Imagine a comparable scenario in which you could publicly gripe about your next job assignment. Wouldn't go over too well in most settings with either your boss or the retailer or the customer.
I'm betting the production guys and the PBP guys weren't thrilled to find out of all the bowls they were going to Boise in December, either. That pops into your schedule and I bet you just jump for joy.
Kind of like me -- what's reaction #1 to finding out you work until 3am Christmas Eve and 2am Christmas day? Would anybody fault you for your reaction to that being, "ugh?" But if you say it once, move on, and do your job, it shouldn't be a problem. It isn't like he was harping on it all week and posting regularly -- it was a single initial reaction. Talk about blown out of proportion.