Acceptance vs. Accountability

Do you accept others for who they are? Do you accept them for all their flaws, weaknesses, and sins? We are called to accept and love all, just as Jesus did. We are called to forgive others just as Jesus forgave us. But why is that such a difficult task sometimes? Why do we struggle to accept and forgive others? We are all sinners and we are all human, so their sins and flaws are no worse than our own. So, isn't it hypocritical to call out others on their sins when you have your own sins?