I also think something missing in the discussions about Charlotte's anger in True Colors, is that Alex's powers are really invasvie.
Because on the surface Charlette is fine. She's kind to Alex, happily plays along in the LARP with Etan, and is clearly mourning Gabe and struggling with his death. On the surface she's putting all the "right" emotions and trying to her best to heal.
But because Alex has powers that are....honestly, very invasive, she's able to see all the feelings Charlotte's trying to emotionally regulate and keep private. She see's all her anger and how her brain is trying to assign guilt to anyone to make what happened make sense.
And yes, Charlotte's feelings aren't very nice, but they're also just feelings. Other than the sculpting scene she isn't actually lashing out at people, the worse she does is tell Mac and Ryan to stop fighting at Gabe's wake, which is 100% fair on her part. It's totally reasonable that she wants to remember her boyfriend in peace without two grown adults screaming in each others faces.
Other than that though, her feelings are kept private before Alex pushes her on them. That's why I don't like people demonizing her for her anger.
At the end of the day, she's not storming around as a ball of rage. She's just working through her complicated grief and trying to find something to blame, which is psychology very common! She's not actually doing anything wrong. Alex just has the powers to dig through the worst of her emotions, and does so, despite the fact that objectively you could make the argument that Alex's powers can be invasive, in the same way Max's power can be invasive depending on how she uses it.
Imagine the most hateful thought you've ever had about someone you genuinely love. Maybe that thought was valid, maybe it wasn't and you were just angry, maybe it was true to a degree but your anger intensified it. Now imagine someone reading that emotion without your consent and being like "Wow! That was an AWFUL thing for you to feel. You should feel bad, even though you probably already to a degree." That's basically what the fandom is doing to Charlotte when they give her grief for the worst things she feels. Everyone is prone to bad, angry thoughts here and there. And I would imagine in a situation like a freak accident those thoughts could be easy to feel since it's hard to know where to put all your feelings since there's not an easy person or event or illness to blame.
Anyways, I love Charlotte and think people can be to harsh on her sometimes. I think she's great, and it's not really her fault for having unpleasant grief that she kept to herself before being pushed, or not expecting Alex to have crazy emotion reading powers that would break her mask. She was just going through the stages of grief man.