Sin is individual and contextual

What qualifies as a sin is different for different people. One’s conscience is informed by their knowledge:

Therefore to him that knoweth to do good, and doeth it not, to him it is sin. (James 4:17)

The erroneous idea of sin as something you can list makes it easy to incorrectly judge others.

When you see behavior in others that you believe is sinful, there are two possibilities. First, they could actually be sinning, acting against their sincere understanding of God’s character. Second, they could be acting in total compliance to their sincere understanding of God’s character, but their understanding of his character is different than yours. In this case, the question is whether their understanding of God in that scenario is greater than yours.

The reason that people were able to find fault with Jesus during his mortal life, in spite of him being sinless,¹ is that they were judging his actions according to their understanding, not his. His understanding was greater than theirs.² He better understood reality itself and the character of the Father. Therefore, his idea of consequences and of what benefited the most differed greatly from theirs. They could have used these differences to learn more about reality or the Father, but instead, they judged him by their lower standards:

And the world, because of their iniquity, shall judge him to be a thing of naught; wherefore they scourge him, and he suffereth it; and they smite him, and he suffereth it. (1 Nephi 19:9)

When you see what you perceive to be sin in others, you ought to investigate why they are doing what they are doing. You might learn more about God than you previously knew.