I've run into this and feel as if I need to say "Hey look what you're saying and how it is not making for a very pleasant moment." What is making you feel like you need to act or be this way? If and when I do say something it is turned around to me... it's not what happened. I was right there, and I know how things occurred. (don't know for what reason, but...)
I guess I feel that situations somehow reflect onto me, even if it is the actions of others. I don't understand why certain moments have to be so uncomfortable. Yet, I know I need to let that person be who they are.