What makes you think I would care if you watch Avatar or not? Doesn't effect my enjoyment of the series in the slightest. I will admit that I do get a kick out of introducing new things to others (be it tv series, movies, games, books, ect.) that they then go on to enjoy. It's fun seeing other people have fun. Watching them discover new things can even bring back a tiny piece of that same feeling when I first found it.
The only thing I feel when I see people like you or the people who refuse to even give something a chance is pity that you may be denying yourself some possible enjoyment over something as petty as whether something is popular or not. Even that feeling is fleeting. It's your loss after all.