That's interesting AlfaQ. I've had the same experience with my wife.
When I first started wearing a bra I was hugely embarrassed. We had discussed it way prior but I was too reticent to ask for her advice. I did tons of research (Reddit's A Bra That Fits was very helpful) and educated myself. Through trial and error I was able to equip myself with bras that functioned well, fit well and looked good. She was happy that I had found a path forward and was comfortable and happy. She has zero issues with my bra wearing. None.
At that time my wife was deep into menopause and having issues. She also did the classic mistake of too loose band and too small cups. As time went along, I grew more confident, enough so that I started giving advice. Gently at first because we all have an ego, and this is a historically female thing that men wouldn't understand. After many talks and some measuring and comparing she went from 38 DDD bras to 34G and is thrilled.
She really doesn't have anyone to have these discussions with. Her mom has passed, she would never with our daughter and has no friends she would be comfortable enough with. So, I am now her bra consultant. We discuss all things bra in depth, quite frequently. I understand what she's going through and what she needs. She's particular. She vastly prefers cotton (It's a skin feel thing) and has had issues with the feel of underwires. We looked and found a bunch of cotton and modal soft cup bras that are working really well. We've also been able to find underwires that she can wear when the mood strikes her. All because she didn't reject me but loved me, accepted me, and found a way to incorporate a male taboo into our healthy relationship. We are both better for it.
It's not one sided either. She is my bra fitter as well. She recommended padded bras for cold weather when my nipples were absolutely killing me. She regularly measures me to make sure I'm still in the correct size. She is first to tell me to put on a bra when she knows I should be wearing one but didn't for some reason. "It's just a piece of cloth. It doesn't make you a woman. Stop worrying about it".
She constantly thanks me for being there for her. She's actually happy to have a knowledgeable husband who is always ready to have bra discussions with her and can offer good advice. If that's because her husband also wears a bra then so be it. She asks my advice on every bra she buys now. We shop frequently though most of her purchases are online due to her size. Mine too for that matter for the same reason.
So, if there are any ladies with husbands or boyfriends who are bra wearers and are reading this, please understand that we can be a great resource. We generally have the male mindset of 'research it til the info is running out our ears. As bra wearers ourselves we tend to understand what you want and need. Don't shame him, talk to him. Intimate discussions like these are wonderful ways to bring couples closer together. If you take advantage of them. My wife did and she's never been happier. She understands my wants and needs and now has someone very close to her who understands her wants and needs and with whom she can talk all things bra. It's a unique and ultimately very satisfying relationship for those who embrace the changes that come into all our lives. Because the only constant is change.
First post and man, I am long winded. My apologies. I just had to get that....off my chest!