Priests are different and may address these matters in varying ways and I’m sure in general they do that in a kind way and without causing embarrassment.
Circumstances in each parish may also dictate what is appropriate, and what is the accepted practice (eg. does one enter the Church upon arrival if late, or wait for particularly suitable times to enter).
It would be most unwise of a Priest to publically embarrass a parishioner who arrives late, or who, perhaps through ignorance/lack of awareness, is careless in some other way in Church. [Such an approach might well be the greater wrong, and in such a circumstance I might not think poorly of a parishioner who responded “in kind” to that priest!
![Wink ;) ;)](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f609.png)
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Where a Priest perceives a need to make known what is required, or what practices are preferred, I am sure he has ample means to do that properly, and in a manner which will be productive, and not the reverse.