This is just a thing that always bugged me... and I think more people can relate, no?
I choose to spend my spare-time drawing, working on my art. Some other person choose to spend their time working on their physique or practice a sport.
I played football (or SOCCER as you silly Americans say) for about ten years, and I was never told I had way too little to do. While I've been drawing my entire life and from time to time I was asked "don't you have better things to do?"
And not just artists... If you're enthusiastic (and know "too much") about certain things, computers, biology, math, robotics, you're often told such things. Also you're often called a nerd or a geek.
I guess it's because they don't understand why we like it so much. Too bad for them!
It's just when I was younger, as I was told things like this I started to avoid showing people my art. Now I don't care much what people think, but I avoid uploading everything I draw on facebook... And I have hardly told anyone in real life about my lion-filled animation project "The Shadowtainted".
...it's sad how some interests are more socially acceptable and some are considered weird. I personally think it's weird how people go to gyms to lift things, or read about a celebrity's personal life, but I don't go telling them they should go get a life.
Haaha, I sound like such a victim... Really, I don't care for people who say things like that, they are clearly just narrow-minded (or maybe intimidated/jealous? #psychology ) and not worthy of our euphoric, enthusiastic, nerdy awesomeness.