I work in Early Childhood Education, your kids fine. They’re just playing as they explore and learn. Your husbands approach just dismisses their voice and doesn’t achieve anything constructive.
If they’re still acting like this by 5ish I might start to be a little concerned, but honestly I’d expect they’ll get bored of it in a month or two.
The tantrums are also a pretty standard response as they’re learning emotional regulation, alongside trying to be independent while learning more things at any other stage of life. Its chaotic, all you can to is be there to role models and guide them through understanding what they’re feeling and ways they can control their state.
If you really don’t want to play along, the best method is re-direction. I like to ask confusing questions, e.g. “the snow isn’t white” “Oh what colour is the snow? Is it red, I like red because I like red apples. What’s your favourite fruit?” Or you could just point to say a dog walking outside the window etc. just something to get them thinking about a different topic.
Might as well throw them out and start with a new one.