It is social media, 110%.

Let me tell you, "back in the day", the only thing that could influence me were my peers, family, television (very sanitized TV, I mean, how much is MTV, CNN, and the evening local news going to make me hostile to others??); magazines (how much can Time and People magazine affect my mental health?? Nothing), and the local newspaper.

With social media, all of my anger, likes, dislikes, prejudices, and so on can feed off social media. And it's not social media, it's the internet in general. If I want to feed my appetite for a specific dislike, all I have to do is search for my dislike and I will instantly find countless other people that will share my opinion.