Though there are benefits to being seen as nice, being too nice can be detrimental to you and those around you in some ways.

• You could be seen as indecisive or non-opinionated. Instead of being honest, you say something doesn’t matter, or you don’t care. This leaves others to make the decision. Not voicing an opinion to others may be seen as insecurity and a lack of trust in them.
• To avoid being left out, you may not voice an opinion. But to be a good friend, co-worker or leader you need to share your views and listen to others.
• If you’re less than honest to others to be seen as nice, that lying will eventually have consequences, including mental and physical pressure.
• Trying so hard to be seen as nice may cause others to think the opposite of you. Instead, you may be perceived as passive and boring. By tactfully sharing your true opinions with others they’re more likely to view you as a dynamic and unique.
• A recent study showed that nice people are more likely to follow orders given to them by an authority figure, even if those orders will hurt someone else. Those who were less agreeable and more controversial by nature were more likely to question the ethics of such orders and refuse to follow them.
• Giving undeserved praise could, in the long run, harm the person and your relationship. Corrective feedback could be very helpful in the long run for all involved.
• Being overly nice all the time can result in disliking and resenting the people who benefit from your oversupply of niceness. Saying or doing what others want, can cause you to become stressed out, overworked and bitter towards the people you think you’re helping.