Awe, I'm sorry this happened to you, I know that must be frustrating, but it's true, parrots simply just choose their "person", and a lot of the time there is no rhyme or reason as to why they choose who they choose. It's not uncommon for them to choose the one person in the house that actually doesn't want anything to do with them, I know a few people who live with their spouse/significant other, and who decided that they wanted to get a parrot, while their other-half could care less. And of course their birds bonded immediately with their spouse who wants nothing to do with them at all, while they are the ones feeding them, getting them out of their cages every morning, giving them yummy treats, and in one particular case my friend doesn't work and stays at home all day with the bird. She lives with her boyfriend, who works all day while she's at home. They have no kids and can't have any, so she wanted to get a parrot, while her boyfriend literally said "go ahead, as long as I don't have to do anything with it or for it"...nice. So she found a breeder an hour away, and put a deposit on a hand-raised baby Green Cheek Conure, and she drove an hour there and an hour back 3 times a week for a month, spending between 1-3 hours with the baby during her visits. Her boyfriend only went with her one time, the first time when they picked the baby they wanted out. That's it. And the day she brought the baby home (while her boyfriend was at work) she said he was a bit skitterish, which I told her was normal, he just needed to settle in. She said he was just sitting in his cage all day long, not playing or anything, and he would come out for her and step-up for her, but was obviously not happy about it, so she just let him be in his cage to settle-in...As soon as her boyfriend came home (and he just wanted his dinner, he's kind of an ass, my opinion anyway, he wants his house clean and his dinner ready when he gets home, this guy is 25 and acts like he's living in the 1950's, pisses me off, lol), didn't the baby bird come right out and fly right to him, and stuck to him like glue the rest of the night. He was trying to eat and he got so mad at the baby bird on his shoulder that he put him back in his cage, shut the door, and said "this better not be all the time, this is already annoying"...And from that day on their bird just absolutely adores him to no end, and basically tolerates her. And he does nothing for this bird at all, he doesn't hate him I guess, I don't know, but he surely doesn't care whether or not the bird is there or not...He actually asked me once at a party if I wanted the bird! I was like "Well no, since he is Kris's bird you probably shouldn't be trying to give him away", and his reply was "He hates Kris! (laughing) He's my bird, and I don't want a bird!"...The entire situation has actually caused a lot of issues between them...
Was your bird DNA tested? I'm asking because it very well could be a situation that could change after he/she gets through puberty. If he's between 1 and 2 years old then he/she is going through puberty now, and once those hormones settle down a bit and the bird isn't being driven by them then his attitude may change completely. Just keep spending as much one-on-one time with him/her as you can, make sure that you are the one who always feeds him, gives him all of his treats, etc. Hopefully he'll eventually bond more closely with you than him. It's tough though, they are stubborn little buggers, and there's just no way to guess who they are going to "choose"...
When I get kisses from my sun conure I always say to him how lucky I am. And it's true!
