Some guys saw him dancing (at a wedding, I think), then took pictures and posted them on the internet to make fun of him. In response, people gathered together to throw him a dance party and demonstrate that it is not okay to bully.
This guy is referred to as the 'Dancing Man'. He was bullied in 4chan (body shamed) after videos of him dancing in an event in Liverpool spread online. Two women then started a campaign called #FindDancingMan and they held a party of 1000 guests in L.A. to raise awareness on cyber-bullying.
http://ak-hdl.buzzfed.com/static/2015-03/6/5/enhanced/webdr13/enhanced-buzz-wide-6017-1425637184-11.jpg
He was just trying to have fun but there are always jerks
I know a lot of wider nice people, like my aunt or my past 6th grade Teacher
2. Another asshole guest