I absolutely hate when people over edit photos and think they look great.
I hate instagram, it allows people that take shitty photo's on the phone to make them look even shittier.
For instance a family member is trying to open her own photography business. Everyone thinks she is going such a good job, but the photos are soo edited they don't look right at all.
For example, here is a older photo that I did like hers... She likes to make everything 100% sharpened and 100% contrast.
http://i477.photobucket.com/albums/rr133/probin007/C86BA68A-AFCC-4DA7-978B-C0D8B823FB72-12028-00000E5B013EBD3B.jpg
tl:dr
I fucking hate instagram and people who over edit photos.