まぁちょっと擁護してやろう(´ー｀)
http://www.oxfordlearnersdictionaries.com/definition/english/hobby

interest, hobby or pastime?
A hobby is often more active than an interest:His main hobby is football (= he plays football). 
His main interest is football (= he watches and reads about football, and may or may not play it).

hobbyはやや積極的なニュアンスがあるのは確かなようだ(´ー｀)