They should be feeding themselves at this age
My LB takes the spoon from me to feed himself, takes 2-3 bites and then starts playing with the food and spoon. My husband has less patience for a mess haha, so he rather feed my son with a spoon. Having said that, LB feeds himself sometimes but it's not a regular thing and he's quite fussy so we feel it's on us to make sure he doesn't go to bed hungry
I would work towards little one feeding themselves. I think this would give them more control over mealtimes and make it easier for them in the long run. I'd also offer a spoon and fork (depending on the meal) so you can see what they prefer eating with. It's also great for their development x
In general the little ones behave differently with the mum and everyone else. Sleeping is easier, eating is easier, getting dressed. You can take it as a compliment that he is completely himself and isn't scared of rejection from you if he doesn't behave a certain way. My little one barely eats anything although she feeds herself. I find it easier to pack finger foods she really likes and let her walk around with it, when I know I will be out and about. Maybe that would work?
Can you and your partner both work on getting little one to feed himself? That might remove the preference issue as it would be something he does independently rather than being fed by mummy or daddy