There is a difference between loving our enemies and condoning their sin. We can love our enemies as we would want them to know Christ as their Saviour as other Christians do, but we also condemn the sins that they believe they are justified in living in. For example, we should love a murderer, not because he murdered but because Christ demands that of us for He wants all to be saved. But we also can sit on a jury and condemm that person to prison or death for his sin.
Absolutely... and it is not friendship or love to tell someone that their sin is ‘ok’.
I would hope my friends love me enough to tell me when I do something wrong, especially when I am in denial of it. I pray I have God’s strength to hear and act upon their correction when I go astray.