There is a difference between carrying no ill will or malice toward someone and the act of forgiveness.
You cannot accept an apology that is not given.
I can feel sorry for someone that has done wrong without forgiving them. I can really, really pray that they change their ways and find forgiveness.
But if forgiveness is simply unconditional amnesty, then it really has no value. In fact, I think that offering forgiveness to people that do not desire it is presumptuous at best and sinful at worst, a form of self-aggrandizement.
You cannot accept an apology that is not given.
If some creep steps on your toe and gets mad at you just to hide his own awkwardness, that is one thing but people can trespass against you with out being aware of it.
I would rather assume they were unaware of it and forgive them.