This is a very a delicate subject and you have received some very good advice here.
Personally, I would avoid the "the h*ll with this! I'm the man and I do what I want" line. That used to work well some 150 yrs ago, but not so much today. Sooner or later you'll have to renew your license and your wife will have to sign it. Good luck with that.
Some guys are more whipped than others. And no, my wife has never sighned for my gun licience. I never said the h*ll with this. I just be me cause thats who I am, my wife didn't marry me to be a pu$$y. She married me for who I am and what I am. And guns are a part of that she never held a gun till she met me and was scared of them. Now she comes out and shoots them. The problem is now is that I have to get some 30 round mags because she likes the feeling of rapid fire. And she tells her friends about shooting and I now have her shooting 308 win. and she likes it. Usually people that have very little knowledge about something become easily ignorant towards it. I always hear people say "guns kill people". My answer is "vehicals and alcohol kill 1000 times more people". I always love the look in there face, it shuts them up fast cause they know its true and can't dispute it.