Audience perceptions of characters in TV shows

It seems as though, a lot of the time, the audience's perception of a character in a story is colored less by things the character has actually said or done, and more by how another character (who is usually a main character or simply more popular) views them. For instance, in the original British Office, Tim, a salesman, spends most of his time bullying his fellow salesman, Gareth. However, because Tim is more popular and gets more screen time, audiences just assume that he is the "nice" one and Gareth "deserves" to be mistreated when there's no real evidence of this. The same series also includes a corporate higher-up named Neil, who is made out to be "mean" simply because he doesn't get along with David, the main face of the show. What are some other examples of this phenomenon from TV, or media in general? Are there any characters who seem to be especially unfairly judged? Do they (or the people judging them) share any particular traits in common?