It's called frustration at a white man's lack of understanding and gall to act like he is qualified to lecture people of color about racism, benny. It's easy for a privileged person to remain relatively calm and appear less "hostile" compared to someone who has faced oppression and obstacles because of their own skin color (and gender, as well).
That said, "screechiness" is more your perception than it seems reality here.
That said, "screechiness" is more your perception than it seems reality here.