<human>: I'm taking a public speaking course as an undergrad at my local community college. Most of us are adults looking to finally get our degrees.

Today, we gave our mid-term speeches. After every speech, our instructor randomly chooses three people to give quick critiques and assign a hypothetical grade.

This guy, who I honestly like a lot, gets up there and gives his five-minute on the danger of pneumonia, which is a perfectly valid topic.

Only problem is... he really blew it. He went way over the time limit, and it was clear at certain points that he hadn't done much to prepare for this thing. At one point, he "forgot" the doctor's name and had to look through his notes to find it only to seem surprised that the doctor's name was the same as the disease, which made us all think he just printed out a quick article on the disease and brought it to class to read verbatim.

Anyway, he finishes, and everyone is being really nice to him. The three people who were called on made general comments on how he did good and assigned him two B+ and an A-.

The professor happened to catch my face when I was listening to these soft critiques and based on my incredulous look of surprise, called on me to make a fourth critique, which kinda surprised me.

In the heat of the moment, I politely proceeded to dismantle this guy's speech. I must have spent two minutes explaining why he basically failed even though I consider him a friend.

At one point during my critique, everyone else started laughing when I pointed out that the guy couldn't remember the doctor's name even though it was the same as the disease he was explaining.

When I finished, the guy look utterly dejected, and even though the professor specifically praised my analysis (and pulled me aside after class to thank me again for being so honest), I felt (and still feel) like shit for destroying this guy's presentation.

Can you summarize the given text in a few sentences?
<bot>: I'm an asshole who destroyed one of my classmate's presentations based on credible analysis, and he earned a high C for it.