Let me break down how Ron was never once “friendzoned” by Kim.
Ron and Kim genuinely became friends as kids when Kim and Ron protected each other from bullying. Ron didn’t become friends with her because, hey, she’s hot and popular, and her being a pretty lady meant she somehow owed him herself. No, Ron is friends with her because she is a good person who backed him up so many times.
Ron and Kim for a good span of the series were either single, crushed on other people, and dated other people. Never once did they resent one another or hold it against one another to be in relationships with other people.
When Ron was realizing he developed feelings for Kim and Kim was dating someone else? He kept quiet about it. He was sad and yet he never used it against Kim or her boyfriend. He kept it to himself for their friendship because he found that his friendship to Kim was more important than to what he thought was unrequited love.
Ron and Kim are how you write well a friendship turning to a relationship. Pay attention Legend of Korra and Danny Phantom!
"Friendzone" is a term for douchebags to use to complain how a woman decided for herself whether she wanted to be with them.
Ron is not a douchebag, he is not a Nice Guy. He is good human being. And he and Kim had a great friendship and a healthy relationship where they respected each other and didn’t treat one another as property.