For you, being ignored by all of your friends and family composes your worst day. For another, losing a son composes his.
A day in which you make it to the gym constitutes a great one for you. A day in which a single meal is eaten constitutes a great one for someone else.
Your happiness is based on how kind you are to others. Another person’s is based on their financial wealth.
Everything in life is relative. What matters to you may not matter to others, and vice versa.
Be considerate.