I would be exceeding worried about the situation indeed, if I lived in Northern Ireland and there was a Palestinian or an Israeli flag flying anywhere near me.
Strikes me that the Israeli government is more than generous with its' programme of expanding urban renewal and development. And what with the IDF being more enthusiastic than accurate, you're be likely to get a Merkeva coming down your Shankhill Road before you could lift your Guinness to your lips - and those fellers don't muck about.
It's bad enough when it's purely local differences and division. To align themselves with any outside hostilities, either in fact, in principle, or in jest even, seems to be downright stupid, and, let's face it, just asking for trouble to escalate.