You really have to look at this from Garnet’s perspective
Fusion is very important to her
Fusion IS EVERYTHING to her
It’s what she IS
If the lyrics of the extended theme song are anything to go by, back home fusion is looked down on. On Earth she’s free to exist as the combination of Ruby and Sapphire
“I will fight for the place where I’m free/to live together and exist as me”
In “Keeping It Together” She was emotionally destroyed to see what Homeworld thought of fusions and the mockery they made of it with the Gem Cluster, and it nearly made them destabilize…
and now…
In Garnet’s eyes, her own friends don’t even respect fusion. They only see it as a way to make themselves feel important and strong. Pearl and Amethyst see fusion as a means to their own end.
She feels they don’t respect fusion
She feels they don’t respect HER…