Oh dear TerrierJohn (my boyfriend is also a town fan BTW)
Are you against other gatherings - Christian Bible reading get togethers, Singles get togethers, Friends of Bill W, and the many other groups that pop up from time to time? On one cruise we even had a Welsh cruisers meet up arranged on facebook.. would that upset you too?
If you don't wish to 'flaunt' your sexual preference I presume you never hold your wife's hand, introduce her as your wife, tell people about your family, have a nice photo with your arm around your wife (or female partner if you are not married).
I was lucky my grandfather, when he was alive, had a very different view to yours.
Lighten up John.. LGBT+ gatherings have ZERO impact on your cruise.. but you would be more then welcome to join one of them if you like. You do seem very interested in the subject.