This is a proverb which means that the big mistake or disgrace itself is not visible. But the mistakes or disgrace of others even though a little but clearly visible. Sometimes people like to criticize, ridicule and vilify others without looking at themselves, as if he was the perfect, holy and pleasant person who never got it wrong.

this is the Despicable Behavior of Sombong (Al Istikbar) which is to consider itself more than others, always feeling bigger, smarter, more respected and richer so that usually an arrogant person will look at others badly and inferior to him.