Until four years ago I used Ryanairs early morning PIK-BVA service around twice a month, and this behaviour was fairly normal for flights going to the Costas during the summer months.
The usual suspects, wearing either Rangers or Celtic tops, would have been tanking themselves up with bevvy since the previous evening, and would continue the process in the terminal bars.
I have also seen the same thing repeated at other airports across the UK from a certain type of traveller, and on one flight I took into Alicante the aircraft had to do a go-around because drunken pax would not sit down and kept blundering towards the toilets. The cabin crew on these flights are not to be envied.
Maybe a breathalyser at the gate would weed them out!