What's a good acquaintance as an expat?

Internations have grown tremendously. People come and go. People moved from one country to another. Along the way you meet people of varied background, profession and nationalities.

Questions to all expatriates.....................
But what if the person you met you found out have done a misconduct of gross immorality or decency that is so against the values you were raised by your family? How do you carry on? How do you maintain a cordial relationship?