People affect each other not only with words and with what we do but also with our attitudes. Attitudes originating from feelings within and not always in our consciousness. That's why we sometimes can experience a swift in the mood in a room full of people if just one other enters the room with a bad attitude. In that sense we are all connected and subject to influencers around us.
And attitudes can amplify from person to person because we all know most feelings, so when we are met with a e.g. negative attitude/ a negative feeling our body recognizes it and matches it.
That feeling raising from a negative attitude will grow because it's not been seen or taken seriously from the beginning. That attitude based on that negative feeling startet in just one person, not doing or saying anything in particular, but just unaware spreading that attitude.
Luckily it works both ways so positive and loving feelings and attitudes, spread as well. Simplistic enough that means that if you love yourself truly and respectfully, you will affects your surroundings positively lovingly. Amplify that and we will end up with a truly loving world. There is endless amounts of love for us all - just let your heart beat the way <3 :) <3