Hmmm... I must say you have quite a few good pointers here regarding joing group outings.
Well, just my opinions; I think it is vrey much like going to church, and I feel photography to each and every individual, is almost religious. In church, the congregations in different mass timings are made up of all sorts, likewise, in such outings people from all walksm character traits & attitudes will likely be in the mix.
So my opinion is simply partake for the sake of the Art of Photography and or for the Journey in Learning this Art form. Don't concern yourself with snobs and show offs, because at the end of the day, regardless of how costly or branded your photo gear are & what transportation you arrived in, it is the quality of your pictures that COUNTS THE MOST.
Nothing else, matters.
Personally, I avoid such group outings for this same reason.
Perhaps a different kind of outing should be created, such as Gear Flaunting Gathering, or Photo Gear Ownership Exposition/Competition for such people.
:bsmilie: