It is as old as time, yet people seem never to remember this rule: Treat People the way YOU Want to be Treated. How hard is that. Lately, I have seen some people be edgy with each other. Granted I know that each person may have stresses of their own that they are dealing with or need to deal with.
Don't take your frustrations or anger out on other people. You may not mean it, but others won't forget.
Learn to control your emotions, channel into constructive energy, where you can use it in positive ways. Is it worth regretting something you could've controlled, but didn't?
Don't take people for granted. Appreciate what they offer and what they can offer.