While I agree that correction should not always be viewed as a personal attack or act of malice, it would be futile to say that the correction, and the reception of it, can be heavily influenced by the way it is delivered.
If someone is tactless in their critique, then, of course, it will more than likely cause more problems than it solves. Now am I saying you must "sugar coat" things, most certainly not, these are adults we're working with, but you can't deliver a message in any kind of manner and expect someone to be receptive. There is a way to say things directly and professionally while causing minimal offense. If
Now some people can handle a more...... Abrupt approach than others.
For example: take an experienced individual who may have a background in a strict family or military, when speaking or correcting a lesser experienced person who may have a similar background, they may be able to bring across points a certain way without causing offense.
Rudeness or brevity is never a requirement for a point to stick. You don't have to be rude to get a point across. There is a difference between assertiveness and aggression.
Training a less experienced one calls for respect, open-mindless, tact, and tolerance from both the learner and the teacher. Tolerance is a key because we are always going to be surrounded by people, whether we are the experienced individual or inexperienced one, who make us want to "reach out and touch them", but in most cases we can't do that without causing more problems.......and losing our jobs. Lol.
Some people will take offense no matter what you say or how you say it.