I'll keep this short.
I have four brothers and two of them have children. I am closer to one of their kids than I am to the others due to having to look after one of them once a week whilst my SIL recovered from a c-section and didn't want the older one (who was three at the time) to feel like he was being pushed out. I'm also their emergency contact at school, purely because I live closer than anyone else and have the emergency house key. I have a strong relationship with them.
My other brother who's kids I adore keep trying to get me to kiss my nephew on the head when they leave. To be clear, I don't do this with any of the kids in my family, I do hugs and high-fives and it's always been that way with both sets of kids. He's insisting that my nephew will know I don't love him because I'm the only one who doesn't kiss him goodbye. I settle for a high-five with him and he loves it and laughs every time I do this and this goes on for a few minutes and in return, I get plenty of laughs and smiles. I treat his kids no different to how I treat my other brother's kids but I've never been asked to babysit due to her parent's and my parent's being closer.
AIBU for not wanting to kiss my nephew goodbye? Do you think he will grow up thinking I don't love him because of this?