Another thought...
Most extra scuba gear, particularly safety gear, is attached to B.C. webbing especially if diving a back inflate or wing. The gear tends to dangle, flop around and is easily noticed. If your extra gear were hidden in either a jacket B.C. or an add-on pocket to a back inflate then less jerks would see the gear to make a comment. Honestly, who cares what you bring underwater? What difference does it make to them? As long as it is not overtly dangerous to either you, your buddy or other divers then what's the big deal? As I have said before, only divers feel compelled to comment on other's personal choices in dive gear. Have you ever seen a skier stop mid-mountain to cajole another skier - a total stranger I might add - about their choice in boots, skis or clothing?
I once had a diver - or shall I say "putz" in the language of the elders - ask why I was carrying a leg mounted small knife on a tropical dive. He asked if I were intending to fight off sharks. I said "Yes, you are absolutely right! And I use it to gut annoying divers who ask me stupid questions too!".
Garv