A real hater will obsessively use your product, yet simultaneously attempt to find any reason whatsoever to hate your product (or you), no matter how small, and be extremely vocal about it, to the point of founding new communities centered on complaining about you. Should you address the issue, they will silently drop that one from their regularly posted complaints and find or invent a new one. Any communication you send to them will be purposefully misinterpreted and combined with half truths and turned against you.
Some of these people probably have genuine mental illnesses that makes them act like this.