Even if a kid grows up and becomes independent, there is just being nice.
My daughter is 10. She will still hug/kiss me and even in front of her friends at school.
But sometimes, she will shoo me away. I always go by her, cues. She is the one to initiate it, at school.
At home, it is both ways.
But, I tell my daughter "as you grow up, you may not like to be all affectionate. But, there is just human decency. Too. And being mature about it. You don't have to hurt the other's feelings if you don't want a hug/kiss. But I am your Mom, and you best remember that..... I am always there for you, even when you are a beast.... it is a 2-way street."
And she, gets it.
I also tell her "I wish my Dad were still alive. I need a hug/kiss still, from my parent. But I can't now. My Dad is dead...."
No matter what, even if a kiddo does not want "affection", they do not have to do it in a hateful way.
I teach, my kids that.
Even my 6 year old son.
And... my Husband will back me up, on it.
There is respect. And there is respect. NO matter how, independent or how old, a person is.
My kids, are ALSO close to their Dad. My Husband. BUT.... they are also close to me. Preferences will or may happen, but... no matter what... they do not have to do it in a hateful or rude or hurtful... manner.
I don't care if they are a teenager or 2 years old or 22 years old. There needs to be, a limit... on how moody/sulky or "rude"... you let them, be. TO you.
And, if my daughter gets rude to me.
I note it mentally.
Then, the next time she wants/needs something... I tell her "do not ever, manipulate me or act all nice or mean, depending on your mood. Or age. I am, always your Mom, I always am there for you... and even if I don't want to. You are growing up. Therefore, you need to be more responsible... for your moods and actions and tones of voice. Now... I am busy. You think about that... and come back..."