In context of work/study or any professional time, it depends on the person being criticized, whether the criticism will be taken as a good (constructive) or no

In context of work/study or any professional time, it depends on the person being criticized, whether the criticism will be taken as a good (constructive) or not. And it is better not to do it publicly. But when it comes to criticizing a person for what he does in daily life or his behavior with others as long as we don't know him, here we have no right to do, it is simply a part of personal freedom: never judge people's actions until they hurt us...