Just FYI, scolding people causes them to resent you. Take great care when giving negative feedback. Courtesy costs you very little and gains a lot.
If you're a manager, part of the job is telling someone that they aren't meeting standard, and that's how I would phrase it. Tell them what the expectation is and ask them to work on meeting it.
Scolding, calling out, or even yelling at people should be consigned to the past. It's unnecessary and counterproductive.