Don't be pathetic

So to start I've been having some body positivity issues recently since my son was born. I've gained quite a lot of weight and covered in stretch marks. Today though, I just randomly felt sexy and actually wanted to have some fun, passionate love making with SO. He brought up earlier how he needed a shower so I jumped in before him and started trying to play with him, get him to come in with me. He told me no jokingly and that I could either have sex or a shower as he tried pulling me out. I gave him a pout that was supposed to be kind of sexy/playful and told him I wanted both. He looks at me and says "oh come on, don't be pathetic..." as he walks back into the bedroom. And now he's just laying in bed giving me the silent treatment since I don't want to now that it killed the mood.