clicks groups annoying people in general

I HATE PEOPLE who when you hang out with someone alone and they are super cool and then as soon as they get around their friends they are completely a different person it makes me so ticked. like if you are going to be nice to someone alone then they should be good enough to be nice to around all your friends. school is to short to be nice to people alone and then ignore them completely in school it just causes more stress when you are fighting with people in school just saying try to be nice with or without your friends.