A new study has revealed a good way to deal with rude and offensive people, which is to disengage or completely ignore them.

The research found that it is better not to engage in a confrontation with such people. Ignoring them sends the message across in a subtle way that the behavior was disapproving.
People who chose to look the other way among people who are rude and offensive were more mentally healthy than those who confront such behavior, the study concluded.
'It's depleting to force yourself to have difficult conversations when all you want to do is ignore the person. Ostracism can serve the regulatory goal of allowing people to conserve resources,' researchers said.
Source-Medindia