"It's not cool. It's scary."

I had a problem with self harm a few years ago. When I finally decided to reveal it to my mom (because I was sick of hiding), one of the things she said about it really bothered me. 

"It's not cool. It's scary." 

I just can't figure out where she got the idea that I was doing this to myself because I thought it was cool. Her reaction made me feel like she was dismissing the problem by ignoring the underlying issues and simplifying it to some weird hobby or something.