Probably been said before, in which case I reiterate, but my old instructor (69 years young, seen it all, done it all) had a similar dressing down from security at a northern airport in front of me and one other student. He asked the security guard what the hell was so important about a high vis jacket that he should come storming over and make such a point here and now and so publicly. The reply was of course that it was for health and safety and so that he could be seen and not run over.
"Well I was over the other side of the airport from you and not wearing my high vis and you f*****g saw me.", said the instructor, embarked the aircraft and closed the door. We, the two students, said nothing. But grinned as loudly as possible.