I think your teacher was riffing on a well known quote, often attributed to Oscar Wilde: “Sarcasm is the lowest form of wit.” Or the common variation: “Sarcasm

I think your teacher was riffing on a well known quote, often attributed to Oscar Wilde: “Sarcasm is the lowest form of wit.” Or the common variation: “Sarcasm is the lowest form of wit, but the highest form of intelligence.” So it may be that your teacher was just messing with you.