Uhh not in public. I did a lot of dumb young-person-train-wreck myself as a youth. As analogy it all boils down to things like how we relate to fellow students (or work alone) in school is mostly not how we communicate with adults at the office.

"This is bullshit" in the source code comments makes your TA laugh and is appropriate at school, but at work the execs and customers who get source access don't think its funny especially if you make fun of the customer. Some of the most trivial basic management skills that often aren't applied in school at all, but are applied at work, like compliment in public and blame in private. At school in algo class culturally all that matters is getting the best O(n) behavior because thats kind of the point of the class, possibly work culture is not so interested especially if there is a basic physics reason or financial regulation reason n can never exceed 3. (edited to emphasize its not that these specific examples were right or wrong, but that it wasn't "gotten" that they were wrong at that work team, but the new guy genuinely, incorrectly, thought it was a cultural fit)

Its not so much being right or wrong in an absolute sense the problem is thinking they know the culture better than they do leading to innocent inaccurate behavior decisions.