Do correct me if I'm wrong because I only had a very quick look. This thread has a lot of pages with very long posts, but it appears the first instance of someone bringing beef from elsewhere related to Sylvina is
this post.
If I am correct you'll see that Sylvina was not the one who first brought up personal external beef and pointed fingers at specific people. I am not condoning their behaviour or what we see in their posts, but at this point I'm starting to feel like this situation is turning into a bit of a bandwagon. They're being cornered in two threads now.
If what happened in that discord is true, then yes they definitely need to approach the game differently. But if they are accused of something they didn't do, and people upvote that accusation, it's only going to convince them even more that their poor opinion of a certain type of player is valid. It will not make them reflect on how they can improve their performance and attitude. It will only fuel their already bitter stance towards raiding.
If I am wrong about who started bringing in personal beef and Sylvina did start it, well then they got what was coming to them.
All this being said Kaiva is certainly correct that pointing fingers at personal beef that started outside the forums and the game is not something anyone should do. What happens outside of SE's games and forums should stay outside of SE's games and forums.