The response that's required to modify anyone's behavior depends heavily on that person's motivations to begin with.
The UGC (unsolicited gear checker) may be acting out of a sense of chivalry, courtesy and kindness. Or he could be a sexist, condescending chauvinist that thinks women always need special assistance.
As is often the case, the truth is likely somewhere in between, with a few other variables tossed in for flavor.
OP, your options seem to be:
- Ignore it and hope it stops
- Address it head-on in a blunt manner: "dude, don't touch my stuff"
- Address it in a tongue in cheek manner that leads the UGC to self-revelation: "are you checking everyone's gear without being asked, or am I special in some way?"
- Address it in a velvet hammer manner: "the only people allowed to touch my gear are the people that have bought me one of these (raise hand to show wedding ring)"
- Address it in a gentle manner: "it's very sweet of you to look out for me, but the only people I allow to handle my gear are me and my dive buddy"
- Address it in the most indirect manner possible, by having your husband address it "honey, tell that mofo never to touch my stuff again"
Which of these you use, and when/where you use it (in the moment, loudly in front of everyone, later in a quiet moment with no one around, via email when you get back, etc) is going to depend on your assessment of the UGC's motivation, and what he'll respond to the most positively.
Having said all that, though, let's list the priorities here in order of importance:
1) Your safety
2) Your comfort level with your gear and the situation
3) His feelings
$0.02