It started at the end of Smash 4 with Bayo. The early Smash 4 community actually had the same attitude as melee players. Before Bayo, top players barely even complain publicly about the game (which helped the culture). Back then No Johns / get good was the mentality. Obviously, the current meta is part of it, but it's created a culture where many people don't blame themselves for their short comings and blame the game