Thank for response. The advice of not responding impulsively is my major Take away.

Your other two questions I feel have one thing in common and that is a feeling of insecurity. Both jokes and rude comments hurt just as much when our own sense of self is based on a weak foundation. What that means is that, largely speaking, are you happy with yourself, flaws and all? Or do you have a selective approach to loving yourself? When we do not feel good about who we are, both jokes and mean comments hurt. And when we feel that someone before us is better than us (on any parameter that we think is important), we often feel very small. In such a case we may end up being mean to them. What's important to remember here is that self worth has nothing to do with looks,intelligence or accomplishments. It has everything to do with how we feel about ourselves. One could be incredibly beautiful, witty or successful and still feel terrible about them selves. It all has to do with a mindset. So if you desire to become immune to others mockery and rude comments, exercise self compassion. That will be the driving force of self worth.