Well… it comes with the good and bad. For one Mercy has been nerfed to the ground or reworked a lot harder than other support. She also receives a substitutional a lot more grief or hate in game. Mercy is often #1 target to kill among any team comp, or gets solo ult one of the most.
Google Search 3/01/2018
mercy overwatch hate
About 3,610,000 results
Ana overwatch hate
About 418,000 results
Lucio overwatch hate
About 525,000 results
Symmetra overwatch hate
About 286,000 results
Moira overwatch hate
About 228,000 results
Of course there are those who are willfully ignorant, delusional, or just want troll to grief Mercy mains more like ritzyuk is trying to do . Dealing with more stress, toxic players with unreasonable demands, require more discipline and focus to get the job done on top of excessive nerfs. Aside from that. I understand the concerns that some Ana player feel the her nano nerfs is still to much. The recent damage buff is nice but it’s not enough. She doesn’t get enough play of the game, or silly teammates that wake up her sleep dart or move too much for heals.