An adjective describing someone whose words and actions express intense hate, such as verbal and physical aggression. Being hate-filled is generally not a good thing since hate is related to conflict and persecution (often against particular groups of people). It is therefore very right
to call someone out when he/she is behaving in a hate-filled manner.
Sadly, many people have been abusing this word. In most cases, the
abusers are advocating for certain causes, and they believe the said cause has something to do with creating a world of harmony among groups... so anyone who dares disagree with them must want to incite inter-group conflict and thus, hate-filled. People on
the political left are particularly prone to this. Fortunately, many leftists have noticed this problem within their own political community and are trying to solve it, so we could probably harbor some optimism about the future of humankind.