Well... It depends what is this negativity you refer to. I don't know the guy, maybe he is really an asshole. However, it's very trendy these days to "remove toxic people from your life". It's an idea that started as an advice for people who were being abused one way or another. But it ended in... avoid all people you disagree with, and all people that don't follow the positive thinking movement and view life realistically, as well as all the people that go through illnesses or other hardships and, you know, ruin your happy mood.
I know people like that. A good childhood friend went down that road. She ended up avoiding everyone she knows because they weren't fake enough to pretend that everything was great, always.