In my opinion is the Greatest gift you get with Forgiveness of other, the peace you receive yourself.
When we are angry at other people, we carry negative energies, that prevent us from exploring thing further.
I agree that something is harder to forgive, then other thing, but it all goes on our Ego, the world around us have no impact on it.
If we allow ourself to "suffer" from thing that we instead should take as "life lessons" then we suffer at least twice.
How many times haven't you heard about family feuds, and no one dare to take the first step to "forgive", and when the reason for the feaud died, many goes around suffer, because they did not end it, and could tell that they love him/her afterall?
It also prevent you from seeing people who have the opinion that you are wrong, it might even prevent you from seeing,aunt and uncle children,grandchildren...yea...there are a lot of negative consequenses.
So let the thoughts about forgiveness be more open, meditations help a lot, by forgive you release a lot of negative energies, you are wiser, you know more who you can trust and who you can not, but this knowledge don't burn you, as much as the "hate" a forgiveness release
And many times when you release this "hate", you will be able to see the situation in a new perspective, and many times one can agree that one overreacted or was a part in it ourself.