Set yourself a chunk of time — could be an hour, could be four hours or a day, or it could be ten minutes — and plan to feel glad to see, and really feel it, glad to see each person that you meet during that time.
Find and feel a reason for being glad for encountering each person you meet during that time. Even people who are “nothing but trouble” for you are showing you something about yourself that is too attached to something, something that is probably based in your ego and not really in who you know you truly are. Be glad for meeting that person or those people because they are helping you work out your real reason for being a human being.
When your chosen chunk of time is over, choose another one, a little bit longer. Or a lot longer if you like how you dealt with that first one.