AITA for telling my wife her asshole is gross?

I don't know where else to say this, but my wife (38f) is super pissed at me (40m) because I said her asshole was gross?

We have been married for 13 years, together for 18 years, and in all the time we've been together, I honestly never considered that she shit, it wasn't something I devoted any thought to.

She obviously does shit, but hides the act so well I've never smelled it. Well today I was working from home and the breakfast burrito/coffee combo I had was unleashing fury on my stomach.

I ran inside and she was walking out of the bathroom, i ran in there and smelled something that just destroyed my nose.

I walked out of there immediately and shamed her for shitting.

I waited until dinner so the kids were home, and our in-laws were joining us. When I was asked how my day was, I said it was great until I smelled my wife's shit. How can she shit?

My kids stared at me blankly and my in-laws said I was a dickhead, but they clearly don't see it from my perspective. I said her asshole was gross and she should stop using it immediately.

Tl:dr - wife did a shit and I smelled it. I thought women shat glitter, but TIL, they do not.