I understand that its easy to be nice to someone that nice to us. God tells us to love one another.Even in the LORD PRAYERS we said " please forgive our sins as we forgive our friends."

is it normal that we only nice to person that nice to us? Yes,
is it easy to be nice to someone that tells bad things about us, hurts our feelings? NO
how many times we need to forgive?Jesus told us to forgive 7X7X7 = no limit.
if we do it ourself....for sure we can't do it. only through Jesus.we need Jesus. 

Many times we loose friendship just because we can't handle the negative thing. many times we fail to become the light and the salt for this world because we can't handle the negative thing.

i know every person sometimes has their big ego. as long as we have that ego its no way we could understand about forgiveness.

do we really want our friends to go to HELL? I guess not.