Because this is the time of year that Stein starts pushing herself as a candidate after doing nothing for 4 years, and this is an incredibly close presidential race where voting third party is dangerous. Stein herself is also extremely questionable as a candidate so of course people are going to talk about it. There is a vocal minority of Lemmings who are pushing Stein and other third parties very hard, so I can completely understand why others are pushing back with threads like this one.