Husband Doesn't Want to Know Baby's Sex

I will preface by saying we have a fairly progressive philosophy of gender and don't plan to push our child in any particular direction. That said, there are anatomical, hormonal, developmental, and social differences between the sexes due to biology and society; we aren't in denial about that and I was personally excited to learn baby's sex. I received genetic testing results yesterday (our anniversary!) and they showed baby's sex. But when I asked my husband if he wanted to know he said the sex really doesn't matter to him and was more interested to see how long I could hold it in before telling him. This was a reversal from what he had said earlier in pregnancy. Part of me is a little disappointed, though I know there are lots of parents who choose to wait until baby is born to learn sex. Anyone else have a similar reaction from their SO?