Yes, one can be assertive and forgive at the same time. When you forgive, please realize that you should not ignore justice. Forgive and stand up for yourself. Yet, if you can practice forgiveness first and let some of your anger subside (if you are angry in these kinds of situations), then your assertiveness through justice-seeking is likely to be better. In other words, you are more likely to ask for only that which is necessary and not, out of anger, take a “pound of flesh” from the other person. When we are less angry we are likely to be more civil.