2-y.o. is all about 'daddy daddy', rejects mum a lot. It's starting to affect mum. What to do?

I've heard this argument that a lot of toddlers at some point start rejecting their primary caregiver (usually the mum) and start attaching themselves more to the caregiver that's been less around. Not only is it more "fresh" and "new" and therefore more "exciting", it might actually have an evolutionary role in making the father more attached to the baby. It's also a way of expressing their independence.

In my case though, I've been around the baby pretty much as much as the mum. From 6 months onwards I pretty much did all the sleep-related things. I do almost all the cooking. A lot of playing. etc.

This daddy phase started about when he was a year and 10 months old. At first it wasn't much, but it's grown more and more and now it's just daddy daddy all the time. Mum can't change him. Mum can't put his clothes on. After shower when we go on our bed to snuggle with the baby while he drinks his milk, he orders the mum to get off the bed and then get out of the room. It's a bit brutal, to be honest.

Sometimes Mum can't be the one to bring water during meals. If she does, then hell is raised.

etc. etc. etc.

I keep telling my wife to not take it personally, that it's just a phase. But the phase has been going on for months now and keeps getting worse and it's starting to upset her.

Anyone else has gone through a similar experience?