Imagine you walked into a surgeon's office, and the surgeon told you that he was squeamish about the sight of blood. Would you want him doing your surgery? Of course not - I don't want the guy who is going to be cutting on me to pass out at the sight of blood.
So what of Christians? We work with the sick - people sick and dying because of sin.
Yet... how often is the tendency to be squeamish regarding sin? When a fellow Christian is hurt and suffering from sin - do we freak out? Do we go "ewwww" -- or do we help them confront their sin, confess their sin, repent and struggle against their sin? Do we say, "This is too bad, too gross, too messed up" - or do we proclaim Christ Jesus, who though their sin is strong is even stronger.
I've long said that a pastor cannot afford to be offended or put out by sin -- of course I can't. My job is to forgive it -- not recoil away from the sinner. We Christians are not goody-two-shoes. We are forgiven sinners who deal with other sinners. It's a dirty, messy life - and we can't be squeamish about it.