We/I didnt call anyone a "little kid". Referring to people simply as a "kid" though, isn't wrong, because as you said, this site is called kidzworld. Also, (this is purely an opinion, so do not feel offended whatsoever) I don't understand how you came up with the idea of 6 being a little kid, but not 10.(I'm supposing you are 10 and are simply defending yourself from being considered a little kid.) Personally, I see no harm from calling anyone a "little". For example, if you have a brother younger than you, even if he's 20, many people will still consider him your "little brother." But that aside, there is no need to be so rude. I never claimed or did anything that would suggest I am against kids. I'm a kid myself too, so there is no reason to feel that I am against kids. But if you felt that I was, I am truly sorry.
Just a word of the wise though, don't complain if someone EVER calls you a "little kid."
Nothing is wrong with being one. and although I do understand that you likely want to become older/ grown up, later on, you WILL want to become a kid again. Seriously, I'm already quite young, but in the inside, I secretly wish I could become 5 again.
But that's just an opinion, and you have yours. So do whatever you want with the information I have given you, and I hope you have a great day.