So glad you found us!
Kind of a harsh, judgey comment, tho, from the teacher. Sure, you should learn how to transpose on the fly. Yup, it's nice to be skilled enough to recognize the chord progressions, know what "numbers" they are, and convert those across keys. Also excellent to know your chord shapes and be able to move up & down the neck effortlessly. Then there are those of us that are still struggling with basics, that really appreciate when given a capo'd version to follow for the acoustic jam so we still get an opportunity to just happily play along with others, and the person choosing the song can achieve the singing in a key that's comfortable for them without necessarily knowing all of the above.