What is the most logical next event?

How to get your dog to be nice to strangers
Notice any people your dog dislikes.
Your dog may react negatively to certain groups of people, including men, women, people of color, or even people in hats. If you notice which groups your dog reacts negatively towards, you can try to change this negative association for your dog.
Your dog may have many reasons for this negative association. If you got the dog from a shelter or as an adolescent, they may have had bad experiences in the past with specific groups of people.