You're right in that the analogy is way off. Here's the only way it would make it right, is if your new date also wanted to vent about your ex. That's probably not the case. But being a Reddit refugee is something in common for many people on Lemmy (especially right now) and so it makes perfect sense for people to talk about it.
Also, I don't give much thought to the posts I scroll past...
We gotta pump those numbers up. Those are rookie numbers.