I am a male and I thought the profile says that.
All the other info may not be needed. I could say the sibling is elder to me by 10+ years. Incident happened less than 6 months ago.
headphones and TOOL OK - this info helps a bit.
Assuming that you want to keep a good rel'ship with them, meet and talk about this. Tell them "I'm not sure if you remember, but when I was down, you said this to me. " Make sure you're not accusatory or put them on the defensive.
If you don't want to do anything with them, you can distance yourself from them.
I think if you still remember the pain, you haven't forgiven the person. If it's a friend then you have to weight the value and importance of the rel'ship and if it's worth holding on to. As for siblings and family members, it's a lot harder because of the connection and history -- and the expectations (all siblings should be happy forever).
People don't change. You can't change people -- only change yourself and how to react to them.
You have to accept them for who they are and as they are. If people continue to treat you badly, then you have to distance yourself from them. But, it shouldn't be about ego.
(*cough*deep purple*cough*)

You may forgive and live and let live, esepcially if you are in an unenviable position of having to deal with that person - sibling, parents, kids, spouse. You may forgive wholeheartedly and even have a strong relationship over time if the otehr person GENUINELY feels sorry and apologizes and makes it upto you by not repeating such words.....
Still you may NEVER forget - again depending on your personality.