Looking past another's flaws doesn't mean we condone poor choices and behaviors. It does mean that we acknowledge we have flaws of our own. It often comes down to intent and presentation. What is our intent? How are we presenting it?
If our intent is to assist someone in increasing their skill, our presentation will reflect our intent. We will present areas of improvement in a manner which will be received as helpful, rather than hurtful. If our intent is to promote ourselves as being better skilled or an individual in authority, then our presentation will usually be harsh, demeaning, and critical.
The next time someone, present an area where you can improve, step back and observe their presentation. This will allow you to constructively determine their intent. Look at your emotional reaction. Are you offended because there is some truth? Are you afraid others will look down upon you unfavorably? Are you afraid you will loose credibility amongst your peers?
These should all be taken into consideration, when you are receiving criticism. Today, take a moment and reflect on times in your life when criticism was received and also when you provided criticism. What was you intent? How was your presentation?