I think Satan has been working overtime in recent years.....
There was a view of Genesis 6 that was prevalent until the time of Augustine. He popularized a Sethite view of Genesis 6 where the text nor anywhere else in the Bible supports it. The sons of God were angels as they are elsewhere in Scripture. Jude verifies this as does 1 Peter.
The angels who kept not their first estate but went after strange flesh were the Genesis 6 angels. Jude then uses “likewise” in relation to Sodom and Gomorrah. Our theological pollution has overshadowed what the text actually says.
Sodom and Gomorrah were evil cities right in the middle of a bunch of Giant tribes just as mentioned in Genesis 6. Their sin is connected to Genesis 6.