I’m sorry you don’t get it. People aren’t upset about his support for Hillary, it’s his role as a highly paid Clinton rabid attack dog. In years past this was the role he played for his right-wing Republican handlers, like when he savagely lied about Anita Hill and helped pave the way for the lifetime appointment of Clarence Thomas to the SCOTUS.
Once he ‘switched’ sides he entered the Clinton kennel and assumed the same pathological role as before — except now his dirty tricks were directed at her rivals. Brock’s tepid apology and plea for acceptance just doesn’t pass the laugh test.