Me as an adult

Sounds more like he completely roasted himself.

Our science teacher is known for roasting people. Today we were revising diffusion and concentration gradients, and this one girl didn't quite get it, so he explained, "For example, there's no gum in the dustbin," *picks up the dustbin* "but there is gum in your mouth, so the gum would travel down its concentration gradient, from your mouth to the bin." And he held it out to her to throw her gum away and everyone started yelling it was beautiful

Oh my gosh, Quora is so awesome sometimes - that question in particular.