Totally agree on this - I have forgiven a lot of shit in my life but the one thing that has truly hurt me is when someone I cared about was offended by my methods of expressing concern to them about their behavior, and they retaliated by trying to get my partner to leave me.
Despite the fact that it was a laughable attempt, the intention to actually hurt me, not just accidental toe-stepping or expression of frustration, is what drew a line for me.
I will forgive unintentional damage followed by remorse, I will forgive outbursts and emotional interaction, but actively trying to hurt someone is the behavior of an adversary.
Tech journalists are used to reporting on people who think their shit tastes like candy just because people are willing to eat it.