In the interest of coming at you from a place of compassion, I'll try to explain it at least in part. I'm at work so if it ends up a bit rushed, forgive me.One of the things that surprised me the most about the Sunny/Pierogi situation was the reactions everyone else had to Sunny's dead mom insult. In my eyes it was just an ordinary insult, and I thought people were going way overboard with their reactions to what she said.
Then last night it hit me. I grew up in a broken household with an emotionally neglectful mom. I mentioned this in the OP, but I'm no contact with my family and that's not changing anytime soon.
I'll never see that insult the same way that someone with a loving caring mother would, because it's a pain I'll never experience. Jabba is in the same boat as me, and it makes sense that the people who don't have an issue with what Sunny said are all people who don't have good relationships with their parents.
Think whatever you want about me/Jabba for our reactions to the comment. All I want is for someone to understand why I felt more for Sunny than I did for Pierogi.
Btw, if you saw Sunny's comment and felt like it was the worst thing she could say to someone, that means you have a good mother and you shouldn't take that for granted.
The context is extremely crucial, as is the nature of the comment.
It wasn't a joke. It was said with the intent to hurt. And it was said knowingly to someone who had let themselves be vulnerable on that specific subject. Who had bared how much it hurt, how awful it has been to live through, and how much it wrecked them.
And sunny knowingly, intentionally, for half an hour made repeated comments doubling down over and over on mocking that grief and loss.
The specific is awful on its own merit. It's an awful comment to make. No ifs or buts. Mocking grief is always an asshole move.
But even if you cannot relate to the specific... You should be able to empathise with the general. To have your weakest moment, your most vulnerable spot, repeatedly hammered while everyone looks on. By your own account, you've been bullied, so you should know just how much that can mess you up. That's why people are so up in arms. This wasn't just a spiteful comment or an in the heat of the moment jab. This was repeated, with intent, without remorse.
I hope this helps with understanding the perspective many others have into this and why it might ring hollow to hear explanation or justification for Sunny's actions or the perception you have of it. Because by most people's metrics, it was frankly cruel.