Is it a big deal to ask, "Please don't touch my stomach?"?

My SO flipped out this morning because I asked him not to touch my stomach. It’s the only place on my body that I don’t want him to touch. I am very sensitive and self-conscious of it, even though there’s not really anything wrong with it. That’s just how I feel. Even if I had a six pack, I still wouldn’t want someone touching my belly. So who’s wrong in this situation? Should he stop his baby bitching and get over that I don’t want him to touch my belly? Or should I stop being so sensitive and let him touch my stomach?