How hurtul - doubly too as they indicated to you they would be open to discussion.

Have you paused though to ask yourself the evidence that they intended to be hurtful? Could it have been a case of bad timing or not knowing what to say? To being uncomfortable or even in a bit of shock?

The ice has now been broken. Perhaps you could return to this person. Acknowledge that they screwed up while at the same time being clear about the pain they caused. Don't just talk about your own feelings but try to get them to give input about their own. It is possible they even knew they royally screwed up.

Do you have another person you can talk to. I say this because you now have the double whammy of not only the feeling or issue that you first opened up about but the hurt of having done so. Try to be careful though not to fall into the trap of bashing this first person. I would try to not even use a name when talking to the second.

I'm glaad you're airing this though. There is something soothing about getting things out.