Friendship is indeed something holy and we have to be extremely careful not to waste it just because we thought that we have what it takes to prove that we are right in front of our friends. Sometimes admitting that you are not right is necessary. There are plenty of cases when friendships and even families are ruined just because people don't have the necessary education that is necessary to understand that even if you have made a commitment you still need to be flexible and respect the opinions of those around you.
Keep friends close if you have them and don't take advantage of them. Handling arguments with friends is something that requires careful attention.