Does it seem right that I hate my best friends 7 year old?
Why do you hate his 7 year old?
My bestfriend love his 7 year old too much, I hate the kid because of that.
It's not nice to hate a child, especially a friends. You should learn to be happy for you friend and his child.
Well, he should know that I'm not a kid person.
You don't have to be a kid person, if your best friend has a child then you're expected to at least put up with him. You should never "hate" any kid, because society would think you're being weird.