This is one of those instances where at a very quick glance, it may appear as pc gone mad, its a woke thing, bloody snowflakes,etc
However with just a little thought put into it then there is more to it than that.
Whether some like it or not, we live in a world where non CIS gender identity is no longer hidden away as it once was- for a frame of reference think how being gay was viewed in the 1960-70s.
People identifying as being a non CIS Gender isn't something new, its just now more people are aware of it, and people are now more open about being non CIS, in the same way as there aren't more gay, lesbian or Bi people now, its just safer to acknowledge that than it was before
Now given the Celebrants profession, in which he deals with a lot of very emotional people on a daily basis, he presumably understands that very emotional people are in a very raw state and that by definition are possibly only just holding things together, and that it takes very little to cause even more pain and upset.
In a lot of instances most would have suffered in silence, not wanting to create a fuss, but on this occasion the person didn't. Given that it was a funeral then you have to think that the person was upset enough to speak to the officiate-and that takes guts and indicates that a high level of distress
So, wouldn't it be a good idea for the OP to take on board that he needs to re-evaluate his opening remarks and see if there is away he can amend them to encompass all who may be attending, without going down the Ladies, Gentlemen, Non Binary, and everything inbetween route which WILL cause offense to everyone.
If only there was a word or phrase that would cover all the people that are there. You know something like "Good Afternoon Everyone, thank you for coming to celebrate the life of........."
It wont cause offence to anyone, doesn't accidentally exclude anyone, and still sounds a perfectly natural way to start the service
You keep saying the celebrant was a he, why? No mention from the OP that they are he, her or them they or indeed a tree.
I would also add, the OP doesn't say that a scene was created, but that AFTER the service was over they approached the Celebrant and spoke to him. He doesn't say it was in hearing of the family (for all we know the person WAS family)
It may well be that the person was doing exactly the right thing, informing the Celebrant that actually he may want to be more aware in future- and prevent any one else feeling excluded.
Done it again
Before posting about this, perhaps you should look up what the word means, and where it derives from, rather than be offended by something which you obviously know nothing about
In what way is the following a "slur"?
cisgender
/sɪsˈdʒɛndə/
adjective
adjective: cis-gender
denoting or relating to a person whose sense of personal identity and gender corresponds with their birth sex.
"this new-found attention to the plight of black trans folks by primarily cisgender allies is timely and necessary"
Definitions from Oxford Languages
Cisgender has its origin in the Latin-derived prefix cis-, meaning 'on this side of', which is the opposite of trans-, meaning 'across from' or 'on the other ...
Doesn't matter what it means if someone doesn't like it why should you believe they should be able to be called it? Double standards.