He didnt overreact.
He didnt type in all caps.
He even said "I dont know if it is lag or I suck."
It could have been lag, I lag all the time on Knife TDMs, everyone freezes on my screen.
It was in fact the host who overreacted.
He promptly called the host an idiot afterwards, if I'm not mistaken. He made problems worse, and he sealed his own fate. I'd insult anyone who accuses their lack of skill on lag, and should they respond in a sentence such as his, I'd reply similarly. Furthermore, I didn't accuse him of typing in caps, and he
did overreact. Instead of responding with something such as "How so?", or something along those lines, he insulted the host back. The host had good reason to act the way he did. Albeit a debatable reason, it's a reason nonetheless.