all you people need to get that in your head. Just because YOU (a general you) think something is not worth doing doesn't mean it isn't.
football isn't worth playing because too many people get injured and most of the times they just fight each other. golf is stupid because it's slow boring and takes forever. boxing is stupid. they just punch each other. etc etc. see what i mean?
What people do, when they do it, and how they do it is up to each individual. A hobby for you isn't a hobby for someone else. That person didn't do or say anything to you. on what basis do you have the right to offend his play style?
you can agree to it and congratulate him, or not agree to it and move on.
people that belittle other people because of their habits or ways are worse than the people they are belittling.