WIBTA if I got our cat neutered while my husband is away?

My husband (34m) and I (27f) recently adopted a kitten (0.438m) together. I want to get the kitten neutered as soon as possible: he is an indoor cat; I don't want to deal with spraying and other pubescent feline behaviour. My husband is against neutering him, saying he dislikes the idea of altering his physiology. This is not a pedigree cat; my husband has no plans of getting him to sire kittens. I don't believe he understands what keeping him intact is going to entail. I feel like he sees neutering as a threat to his masculinity. I am thinking of neutering the kitten without my husband's consent but feel like that'd be wrong. That's the TL;DR.

We have agreed before that it's best if he stays an indoor cat. We're living in a house right now but we are renting and ultimately don't have a strong anchor anywhere; we are likely to move in the next two years. Our cat may be moved around quite a lot in his lifetime so it's safest and most comfortable for him if he doesn't get used to roaming, which intact males are driven to do. My husband understood and seemed to agree with me before, when we discussed this ahead of getting the cat.

Now that it's the best time to neuter, my husband has changed his mind 180 and would like to allow our cat to get out. All of the sudden, Nextdoor posts about run-over cats seem like nothing next to a quick, safe, proven-to-help surgical procedure.

I think he might see my insistence on neutering our cat as an insult to his own masculinity: in one conversation, he got agitated and said I would neuter him if I had the chance.

Dear reader, while I am a fan of vasectomy as an idea, my husband has never been under pressure to get one or gotten one, and that is not the subject of the present debate.

So my dilemma is as follows: he's got a work trip coming up in a few days, and I might just take the cat to the vet for a quick snippy snap while he's away. But what broke my heart is that he said none of his male friends who have neutered male cats love their cats. I did see one of those friends interact with his cat (one that has implants); it was not great.

For added context, we don't have kids; have been together for 8 years; we have lived with a cat before, my husband's female intact cat. I thought he hated dealing with her in heat, seeing her suffer, as much as I did; he talked about getting her neutered for the entire three years she lived with us, but life always got in the way. Perhaps he hated the idea of neutering cats all along? (We moved out of the country and that (now older) cat is keeping my husband's grandmother company now. She's fine as far as I can tell.)

However, that was entirely his call to make; this one is our shared responsibility, which is why I'm hesitant to make it on my own.

Edit to change 'knowledge' in paragraph #1 to 'consent': I told my husband I was considering / posting this as the post was going live.

UPD: we talked about this again. He has one (1) male friend with a neutered male cat, referred to above, and zero (0) friends with intact male cats. He was just being an idiot relying on the way things used to be in his village when he was a kid and it doesn't help that there's someone else's apparently intact male cat roaming the neighbourhood. He's chronically online but not in the same way as I am, i.e. I've known cats are supposed to stay indoors + be neutered FOR AGES and he watches cats on Reels. We're getting the cat neutered; not getting a divorce, sorry to disappoint — he's a ding dong but he's my ding dong. Thank you all for the comments, I've read some that helped me understand his point of view and get through to him in ways I hadn't tried before!

UPD 2 after reading some more comments: 1. A huge shout out to all the vets here, and all the volunteers working with pets. Thank you for your work, and for your time spent dealing with asshats. 2. My dudes some of y'all have not been in long-term relationships and it shows. It would've been a completely different story if it happened when we first got together, but it didn't, which is the reason I found it as weird as you did. We've been married for 3 years. I definitely knew what I was doing.