Baron, it sounds like your ninth-grade English teacher was my kind of guy. I'm not sure such tactics would work today.
You're right, of course: "you know" and "like" have been plaguing the language for decades. (With my own ears, about twenty years ago, I heard one of my students say: "and the phone rang and I was like, 'hello?'")
Maybe it's my imagination, but the problem seems to have gotten worse lately - to the point that the typical undergraduate almost literally can't communicate without a "like" or "you know" every few seconds. I don't think most of them are even conscious that they're doing it.
Young people's writing is worse. When I was an undergraduate (not a particularly good one), the professors routinely deducted one point for every misspelled word or grammatical error in an essay exam - in any subject. If I used the same system I'd literally be flunking almost everybody. When I get an undergraduate who does know the difference between "its" and "it's," or "to" and "too," I sit up and take notice. And when a student reminds me that "this isn't an English class," I just say, "there, their, they're."
I wish I had a dollar for every ROTC cadet who couldn't spell the word "soldier." Or "corps." Or for every underwater archaeology grad students who couldn't conjugate the verb "sink." Or for every military history student who mixed up "cavalry" and "Calvary," or "naval" and "navel," or "guerilla" and "gorilla," or "seaman" and...well, you get the picture.
Ahhh, retirement....I'll miss my students like I miss a departed relative, but I won't miss what they do to the language.
I also, however, have to be careful throwing stones from inside a glass house. When I've re-read my own posts on this Forum I've found some awful howlers.