Gender neutral colors!

My boyfriend and I have been pretty excited that we're expecting our first baby together! He couldn't wait and wanted to go shopping today for some simple gender neutral baby clothes. We got greys, whites, blue, yellow, some green. He was very excited about the clothes and decided to show his mother. I didn't want him to show her because she's really judgemental... Well she starts going off saying, "since when is blue neutral? What if it's a girl!? You're going to put your DAUGHTER in blue and green?!" Idk if it's the hormones but I got pissed. This is why I didn't want him to show her but I don't want to ruin his happiness and excitement because it's the cutest thing! What colors do you guys consider gender neutral?

UPDATE - I realize all colors are gender neutral but when it comes to baby clothes... I'm not putting my son in a pink onesie that says, "Mommy's little girl" or my daughter in a red onesie that says, "Daddy's little man" 😂😂 most of the clothes I saw had stuff like that on them.