Have you considered that when you are triggered by someone else, it might not have anything to do with that person at all? It probably has nothing to do with the situation at all, not with anything that is here and now.
Often when we react strongly to a situation or a person, it reminds us of something we experienced in our childhood. Something that we have not yet processed.
You can't change others, but you can do something about how you react to others. By working with yourself and looking at what patterns you have with you.