It would be different if he acted his age in that aspect and wasn't seeking that much attention/affection. We're talking about parents and children who probably don't share the same relationship. I can understand your case but, we're talking about apples and oranges. It's not your actions we're talking about either, but the actions of two humans who--more than likely--don't have the same type of relationship as parent and child.
Hell, I've seen parents who have/had INFANTS who've never kissed them on the lips! It's a matter of personal opinion and in mine, six (at the most) is too old for parents/children to be embracing each other like that.