I have no idea what they've done this time - in the past they've set off a flare, shouted and sworn at individual players via megaphone (including various homophobic slurs), argued with Woody and Pete on multiple occasions, and generally wound up many of the 'more experienced' Fort fans. When they've been ejected previously during games, they've just walked round to the Ben side of the pitch to watch the game through the fence and kept at it with the megaphone.
They are just wee boys at the end of the day, would be surprised if any are over 16, and while they bring a bit of atmosphere they have had numerous talkings to and asked to tone down some of the language and behaviour. If they've not taken responsibility, then don't really have an issue with Pete/the club barring them.