Haters gonna hate. I feel like this has got better over the past few years but there was certainly a culture where being nasty online was acceptable. When I was a teenager I was playing around with web design and posted the finished design on a facebook group. I got the exact same response 'this made my eyes bleed'. Certainly knocked confidence but ultimately it says more about those people that their lives are so sad they have to put others down to feel better themselves. Classic bully stuff.