This is an interesting example of the positive effects peer pressure can have. In high-school a friend and I decided to hit the weight room every morning before school. He was on the football team, and I'd joined the wrestling team (with no prior experience). He was more dedicated than I, and would roust me from bed every morning. When I told him I wasn't up for it one morning, he threatened to start ringing the doorbell which would wake my parents, something I didn't really care to have pinned on me. It worked, and I was more consistent because of him. Moral of the story: Find a workout buddy.
Good for you?
Why the snark? They're just providing another piece of data in an open discussion that may encourage more people to try the app. What's wrong with that?
If your argument is that the comment didn't add much to the discussion, I'd reply that yours added even less.