It's ironic the cliche you use is contextually moral equivalency, the plank being more morally evil than the spec. Why do you absolutely think no one should be a recipient of moral condemnation given that no one is an angel? Do you think we should never hold people accountable?
The whole point of the parable is that if you aren't faultless yourself, don't go pointing out faults in others. That's why I used it. It seems self-evident that it's making fun of those that acuse others of doing the very things (or similar) themselves. The man was making fun of gaslighting 2000 years ago.
