Just remember to pick your spots. Don't "talk back" when you still need something from that controller or if you can be easily identified. A good trick is to have the pilot who hasn't been on the radio (ie CFI, PF, etc) make the smart-ass remark and hopefully the controller will think it was another aircraft. Sometimes controllers do bonehead things just like we do. Most controllers have a good sense of humor and don't get bent out of shape when you call em on something.