Partner doesn't like baby clothes 😕😑 (UPDATED)

My partner has made it clear he only likes certain colours and styles when it comes to baby clothes for our son, basically grey white blue or dark blue. That's fine, I get it. I am a little picky too TO AN EXTENT.

Recently, his feelings have gotten stronger. To the point that after we opened the gifts from my baby shower yesterday he suggested we go through all the clothes and make a 'keep' and 'throw away' pile...

I couldn't believe it and felt like the floor just dropped from under me. These were all new, non offensive things people had bought our son and he wanted to get rid of half of it straight away...

Today we finally got around to making the bouncer I'd bought online and low and behold I'd accidentally ordered the wrong one... Right brand almost exactly the same as the one we decided on together except it had bits of light green and yellow on it 😑 so of course he decided we had to sell it or stick it in the garage because he was 'absolutely not ever putting our son in it' even though I'd spent over $100 on it. So obviously I wasn't happy about that haha

So I really don't know how to handle this. I feel like he's being wildly immature and ridiculous and can't believe he's acting this way all of a sudden but if I try to talk to him about it he says I'm cutting him out of the decisions and he should be able to decide what our son wears and uses...

Any advice? Thanks

Edit: so we're usually pretty level headed people but the last few months of my pregnancy has been difficult for us... We had an argument today because he feels like I steamroll him with decision making and I felt like I try to include him but ultimately do usually end up being the decision maker. So he's saying he's started to be more assertive and aggressive with what he wants so I'll listen to him. I don't really know what to do about this. He also feels that I don't respect or listen to him enough so maybe that's part of the deeper issue behind this... I honestly don't feel the way he does about us and that makes it difficult to repair. I don't think either of us are being the rational people we usually are because of our relationship problems so yeah I know the colour thing sounds crazy but really he's not usually so stubborn.