It is not acceptable to hurt another persons feelings.
Tony's made a new friend whom he has been hanging out with a lot, and just called to see if he wants to hang out today.
Tony wants to spend a few days alone.
Tony tells his friend he needs a few days to recharge, and that they should hang out next week.
Tony responds to his friend by calling names and being very rude.
Tony's friend understands and gives him the space he needs.
Tony's friends feelings are hurt, and he stops being his friend.