Being caring and nice to people is a great gesture. However, as you would climb the ladder of success in your career and learn to understand different people, you will see that your good and easy going attitude at times is taken for granted.
There will be situations in your personal and professional life where you must absorb the severity of the situation and maintain a 'Poker Face'. It's not about being unfair to anyone but to control your thoughts and act rationally without any emotions.
This also calls for tuning your brain to 'let go' of certain situations that often occur in your daily life around work stress, and personal conflicts. When you know you are right, my best approach is to 'not' defend yourself.
Learn from everything good or bad that comes your way and move on!