Last weekend I flew MEL-PER. The two lines were clearly signed but by the time I boarded people were only queuing in the priority lane. The gentleman in front of me had his economy QF Bronze boarding pass scanned and I bit my tongue. The agent then scanned my QF card and I hastily headed for the jet bridge. He said 'You need your slip. You should know that'. It wasn't done in a scolding manner and I wouldn't ordinarily have cared less but I retorted "This is supposed to be the priority boarding lane but that doesn't always walk either, does it", then turned back to the jet bridge. The agent said something to the affect that the person in front of me was entitled but that certainly didn't appear to be the case. Walking up the jet bridge a woman who obviously overheard the exchange called me a drama queen. I ignored it. I rounded the jet bridge and she said it again. I still ignored it.
During the initial pre-dinner drinks service in J the CSM apologised for the priority boarding failure saying "I know it's something we're consistently inconsistent at" and said he would provide feedback. I was genuinely impressed by that but do wonder how and why my comment was passed onto the CSM, particularly if the ground agent believed he was in the right.