Thank you, Ben Levi. If I recall correctly, Chazal does say, as you mentioned, that mishkav zachar was what sealed the fate of the Dor HaMabul, resulting in the destruction of almost the entire world.
Regardless of whether or not it’s appropriate to make a public statement on the matter, I’m surprised any Torah Jew could be so cavalier about toeiva marriage when Hashem called it an abomination straight out in the Torah.