"And why beholdest thou the mote that is in thy brother's eye, but considerest not the beam that is in thine own eye?" Matthew 7:3
It is hard to decide if more words are needed besides the scripture itself. Probably all of us have criticized others, and sometimes for things far less important than our own "sins" of commitment or omission. Jesus is saying much the same thing he did when he said ". . . let he who is without sin cast the first stone".
Plainly said, eliminate our own faults before we start looking for fault in others. Ours probably are worse than theirs.
There is a joke going around recently. Even Joel Osteen told it in a sermon. It is to the effect that a recently departed, when arriving in heaven, wondered why so many sinners were there -- thieves, murderers, etc. When everyone remained silent, God said to the new arrival that he would have to forgive everybody, because they were stunned to see him there.
That is so like us all. We consider ourselves right and perfect, while being snooty about the faults of others.