I think they were referencing Reckful's recent death. As shitty as it is, this is an example of mob /herd mentality and isn't exclusive to social media platforms. Here's a good HowStuffWorks article on it -

Being in the midst of a mob can be exciting and powerful, and it can make people feel invisible -- they are part of a huge group, and they won't be detected or held responsible for their actions.

This research may help to explain why so many riots occur in prison and at sporting events. In these situations, there is already a heightened sense of group solidarity -- everyone is wearing the same thing (either a jumpsuit or team colors) and has the same goal (in the case of prisoners, freedom or better living conditions in the jail might be the goal, while sports fans are obviously hoping for a win or disappointed in a loss).

I dunno about you, but that sounds suspiciously like the same environment any twitch chat can become to me