I had to take a very long moment to admit to myself that a few seconds of a video game (and a very badly done few seconds at that) just messed me up so hard I was going to feel it for days.
Astarion was a surprise, and not a pleasant one at first, because it feels almost intrusive when interacting with a video game character makes you feel like looking into a mirror. And as I saw more and more of his scenes I almost trusted this game to treat the subject with respect. Almost. But that little amount of distrust still didn't prepare me for that.
Oh dear, I'm so sorry you felt like that. It's been very similar for me too.
How the ending is currently handled is absolutely uncalled for and I really hope that Larian is going to revisit it.