To condone means to overlook and accept as harmless a behavior considered immoral or wrong. It means to make allowances for a bad behavior without criticism.
When someone behaves in a certain way, a way you do not approve of or you feel it’s not appropriate, and you do nothing about it, you’re allowing it to happen. You’re looking the other way and pretending you didn’t see it. Therefore, when you’re lenient with objectionable behavior, you condone it. When you condone bad behavior, you allow it to take place.
If you condone dishonesty in the company you keep, what’s to stop you from becoming untruthful yourself? After all, we are known by the company we keep. And nowadays, with technology and all, we’re also known by the ones we choose to follow or befriend online. If you choose to follow a certain twitter account or a certain blog, and you allow that person to behave a certain way and say the things that person wants without doing anything about it, what does that say about you?
Be careful what kind of behavior you condone. Because that shows your character. And character is everything.