How can you have unintentional hate? This shows the mindset of these people - if anyone chooses to take offense at what you say, regardless of how you intended it, it is hate. This obviously turns the meaning of hate on its head. Reminds me of the Queen in Alice in Wonderland: "Words mean exactly what I want them to mean, nothing more and nothing less."
Yes, much like the term "unacknowledged homophobia". (or racism) substitute what you like, it means you are not a card carrying member of the left agenda, and are subject to the most degrading isolation that the left can provide if you happen to be in a job or community where you are constantly around leftists.