Very good!
Even as Sodom and Gomorrha, and cities about them, in like manner giving themselves over to fornication, and going after strange flesh, are set forth for an example, suffering the vengeance of eternal file. (Jude 1:8)
Fornication, strange flesh -- sodomite filth.
Likewise also these filthy dreamers defile the flesh, despise dominion and speak evil of dignities. (Jude 1:9)
No mention of violating a guest/host compact, but condemnation of sodomite sexual perversion.
I also find the reference in Ezekiel 16:49-50 ironically condemning - connecting “pride,” a staple homosexual slogan, with haughtiness and judgement.
How do they miss this?
That isn’t what the angels were judged for. It was the sex between Angels and humans mentioned in Genesis 6. Not sodomy. Sodomy was part of the sin. I believe Sodom and Gomorrah were as the Bible says “exceedingly wicked”. Jude also mentions fornication. When the Angels went after strange flesh in Genesis 6, it was in direct violation of the Creator’s command to reproduce after one’s own kind. It also brought about a certain powerful race of hybrids whom God destroyed. I think these are the origins of the Greek mythological characters. Wild I know, and foreign to our thinking. But, the more I study it the more convinced I am. One of the chief sins of Sodom was their attempt to have sex with angels. I believe they were attempting some sort of spiritual treason with this act which sealed the deal with God. They did all the other things as well. But they lived right there in the middle of where the giant tribes lived and they knew them quite well (Genesis 14). Abraham went through and wiped out Giant tribes. Joshua ended up doing the same in the cities he destroyed, except some escaped to Gaza, Gath and Ashdod (Palestinian territory today). See Joshua 11:22 on that last one.