People need to learn that their actions do affect other people. So be careful what you say and do, it’s not always just about you.
Do you have any friends or colleagues who are negative? If so, you’ll know they aren’t the most enjoyable people to be around. Negative people can be real downers in any conversation. No matter what you say, they have a way of spinning things in a negative direction. Some negative people can be so negative that it feels draining just being around them.