Not kill him but perhaps ask him not to air his opinions on a public forum but perhaps via a PM to the organisers. And maybe do it in a constructive rather than critical manner. A bit of decorum might be in order.
You complete arse sir. I went last night for the first time too. I found people to be friendly and welcoming. As said by those before it is about raising a bit of cash and honouring the memory of one of our own. Many people give their time freely for this and you have the nerve to slag their...