It's mean to laugh at other people's failures, and downright villainous to laugh in their face while they fail, but when people post their fails online they know the laughs are coming and they don't care.
And when they post pics of their cooking fails online they expect people to crack up, relate and share their messed up dish with others, because every cook has been there, burned that.
Cooking fails shouldn't discourage you if you're not that skilled in the kitchen, they should make you feel better about your own fails and inspire you to get in there and cook until your dishes stop falling flat.
And when you're able to cook up a feast for your whole family without breaking a sweat you'll look back on these bad fail days and smile.