Some people can be so disappointing sometimes. I think no matter what anyone did, at least give people some credit for trying and actually doing something. Especially if all you do is sit around, minding your own business and making a mountain out of a mole hill over every single thing in the world.
If it's a constructive criticism then by all means. But if it's just saying it because you want to say it then don't discourage people from doing things that you all don't even bother to. If you can do better, then do it. If you can't, then the least you can do is keep quiet. Stop laughing at people's work if you can't even produce something like that in the first place.
People should learn to respect other people.