There is a sentence in Hebrew that the Sages of Blessed Memory said:

"אין אומרים כל שבחו של אדם בפניו,מקצת שבחו שלאדם אומרים בפניו, וכולו שלא בפניו" No man's praise is said to him, Some of the praise of a person is said in his face, and all in his face

Very difficult to translate it into English, but the translation is:
That when a person praises his face then it leads him to want to keep moving forward
Therefore, it is clear that there is nothing wrong with saying praise, each person needs feedback from his environment, and everyone has the need to feel that someone loves and values him.
What this means is that if it helps a person in a good and correct way, he should be told and enticed
But, if the statement will produce the opposite result, do not say to him.