perhaps there is no "need," but truly, is it offensive? i remember a few years ago, i was at a Good Friday service in the late morning... a gal walked in very quietly, late... i think she was on a work break... she found a seat and the priest noticed her... he said, quite sternly, "you're late!" and then i think he realized how he came across and very kindly said, "you may have a seat."
when the service was over, and my two young sons and i were driving home, my youngest son, out of the blue, said, "you're late!" and my older son said, "you may have a seat." and then we all started laughing...
now when any of us is late, we go through this whole routine... "you're late! you may have a seat." :)
Funny story by the way. :)
It's just part and parcel of the attitude of the priest who:
(1) Likes to add phrases to the collects and to personalize the responses; (2) Likes to drop parts of the order that he finds tedious or replace them with something else he likes better; (3) likes to give homilies about the funny thing that happened to him on vacation rather than about the Gospel reading; (4) likes to take the mic from the pulpit and wander around; (5) likes to deputize 15 extraordinary ministers to communicate 50 people while he sits in the sanctuary . . .
And all the other things we've come to dread.
LOL!