If you plan to attempt high-minded, you must deliver same. I'm neither a grammarian nor an English teacher. Writing has been my job or part of my job for 35 years.
A&M's most esteemed man of letters presents himself with a raised nose and raised sense of himself. From a college man:
Dear Mister Farkquar Fuckstain,
Your writing improves with every new effort. This represents your best work to date.
Sadly, you undermine your premise with name-calling and a logical argument that stabs itself in the testicles.
You state that you observe two "tu" students who speak poorly. You conclude that all "tu" (if only this institution of higher learning could dispense with that silly slur!), students must be uneducated and poor speakers. This reasoning is equivalent to suggesting that you've observed three left-handed mechanics, therefore all mechanics must be left-handed.
[Farkquar reads this and thinks, Yes, and?]
Perhaps you, yourself, should consider becoming a mechanic. They make excellent money and are not called upon for much, as you describe, professional communication.
The good news, Mr. Fuckstain, is that you are well on your way to passing Remedial English this time around! Well done!