I think too many people get upset about swearing. It brings a strong emphasis, it's not disrespect imo. Knowing how Linus is, I'd take that response in stride. I appreciate his direct approach especially to the brazen arrogance of someone too full of themselves to see themselves as wrong. It wouldn't be a great way to start a conversation, but as an ender it's terribly effective. He called a fucking idiot a fucking idiot. That shouldn't be toxic. Not everything that hurts someone's tender feels is toxic. The intent should be taken into consideration.