It is how we perceive others which determines our behaviour towards them. A few times even if the person whom we care so much for damages our feelings irreparably, it is our perception of them which we should never let get damaged. It is upto us to be indifferent and not reply rudeness with rudeness, for hatred breeds hatred, rather we should show that we still care for them even if they keep hurting us with their hurtful words and deeds. Buddha says only love can conquer everyone for you and if you show a compassionate heart even the rudest enemy shall melt before you like hot wax.
It is upto us to take the things seriously which might make us serious about frivolous issues or just toss them away into abyss and keep strolling happily like before. It is upto us to bother ourselves with what others think of us or simply leave it to others ! While we act on the latter we must never let even the slightest splinter of hatred survive in our hearts or else our peace will be incomplete and our mind restless. Our mind should be free from emotions which trouble our peace because if we make ourselves unhappy we can never hope to spread happiness to others.