Makes sense. Got to remember, Seth is a warrior and the god of war. Those tend to be seen as masculine traits.
I not sure if its related. But historians do say some of Egyptian mythology and ideas gets reinterpreted into Greek and Roman mythology. In those cultures masculinity is very important. Homosexuality is allowed, but men that "receive" are not considered masculine. They can be in a same sex relationship but to remain "masculine" they have to be the one doing their partner not the other way. Otherwise they aren't seen as real masculine men.
If you use this as context then it makes sense why Seth is extremely ashamed to let what happened to him known to all the other gods.
Its about why seth is so afraid to reveal the truth, read it through autotranslate but its something about how seth values so much of his masculinity