Thank you all so much for your wonderful words of kindness and insight.
A friend of my son and I came along because he knew my Mum. Rev Ron of St Paul's New England Peterborough. We invited him. He is a genuine chap. A Nottingham lad who 'got religion' later in life.
He went to introduce himself to the Jobots, just to be friendly. (He was wearing his dog collar). He said, 'Hi. I'm Rev Ron, I was invited to come to this funeral.'
The crowd of Jobots ignored him and one of them said, 'We were invited too.' and left it at that. I spoke to Ron after and he just laughed about it because it displayed 'cult' 100%.
As JeffT said ,
They can't set their petty rules aside for five minutes and act like decent people.
the Jobots just can't let it go. I expect they felt really special being rude to a perfectly respectable bloke. Do they think this will attract people into their cult?