Thank you, Johnnysgirl and Twawmyarse!
Honestly, it astounds me that some people seem to be willing to tribally defend any situation if it has a passing acquaintance with a rainbow logo. You should not arrive at a position in discussion out of sheer contrariness, because it is no substitute for emotional intelligence, situational awareness, or knowledge of cultural and legal norms (the arguments over churchyard regulations regularly end up in my local paper!)
Were they always lacking in emotional awareness, situational awareness and knowledge of cultural norms around churchyard etiquette, or do they selectively lose their skills for the sake of arguing on particular topics? Why descend to petty point scoring about the significance of the rainbow in Christian theology when we're discussing respecting grief?
Seriously, a churchyard is for all grieving family members, not only people who want to combine celebrating the NHS with their visit.
Beyond that, this is incredibly bad PR. As a regular poster in this section, I know who here is a transactivist. So will other posters and lurkers. Why on earth would you go out to associate your activism and cause with emotionally insensitive people who trample over grieving people's feelings just to annoy feminists on mumsnet?