I think: not so much about yesterday's rude singing at PE but trying to explain their attitudes generally in a quasi-offensive way (or not caring that it's a bit generalized & offensive, take your pick
)
1 - they are genuinely convinced en-masse that the entire World is against them & determined to turn them over - in terms of UK Establishment historically speaking, they might have a point
2 - a lot of them are a bit thick & some are old school footy fans - in higher % than you might find elsewhere
3 - they will admit nothing - do your own jokes here, but also something a bit cultural & ingrained
4 - they won feck all for so long, everything is a bit desperate every time a bit of hope emerges