TweetI will admit I do it. I am overboard with politeness in public. It is because I DEMAND it in return. I know it not good. Or fair to the other person. It's how I cope with some bad anxiety issues. I wouldn't necessarily car about " bless you" after a sneeze but I will say something if people don't say excuse me when brushing by or thank you when I hold the door. I am borderline agoraphobic and it manifests as rage.
Its dangerous for me and others. It sucks...
I know it's more than you asked and possibly oversharing just explaining a little.