Anger is a feeling, it's internal. Reacting externally with anger is a choice to be a dick. If you can't tell the difference, you have some growing up to do. Linus did.
The whole thread is about overt display of anger being linked with masculinity (with or without the label of "toxic"). You said "Masculinity is fine in all it's forms." It is reasonable to assume that you meant childish displays of anger was included in masculinity and that you didn't consider it toxic at all.
I consider masculinity completely fine. I consider the idea of toxic masculinity used to describe actions men take as an intentionally gendered misnomer.
"No" does not need to be said in anger. Being firm has nothing to do with being castrated. Maybe overt anger itself is a sign of insecurity and insufficiency. Do you think Linus has been castrated now that he behaves more like an adult?