"Sandwiching" your critique between two positive things about the person's softens the blow, and avoids it coming off like an attack. The mix of positive and negative makes people more likely to pay attention to the whole package.
Instead of being snarky and vague, explain why you think your criticism is valid and be specific and constructive about what you think would be an improvement. The former doesn’t inform much and makes people unhappy; the latter at least gives some ideas for improvement.
Pull the person you want to correct aside for a private, one-on-one conversation instead of highlighting their error in front of a larger group.
Also, to correct them before they get in trouble for their mistake. A little embarrassment right now will save them even greater mortification in the long run.
The more specific your feedback, the more actionable it is for the one receiving it. Example: Asking for an article on communication is vague while asking for one on public speaking is specific.
An specific feedback that doesn’t target the person is easier to understand and act upon.
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