No excuses for going under a barrier.... Its not a matter of not being an experienced flyer at all. Its a clear case of "I am more important that the rest of these morons standing in a line.....". I'd have said something for sure. Not rudely or sarcastically, but certainly firmly to the effect that what they were doing was not on and that they'd best go the rear and wait like the rest of us are.... This is the sort of thing that happens when people say nothing. Unless we who realise that there is a system in place for a reason, ie a queue in order to process people in a timely manner, speak up and tell these people that their behaviour is unacceptable this sort of thing will only occur more and more often. You don't need to be a Platinum FF or a Rocket Scientist to realise that your simply do not lift a barrier and push into the middle of a line.