Your encounter mirrors the experience of many OC'ers. Not just in PA but the country. (hint: check out opencarry.org discussion forums)
:)
It's a shame that so many of these LEO interactions contain the same two commonalities.
1) Editorializing on their personal opinion "appropriateness" of OC.
2) Outright lying about others being "concerned" as a n excuse to give you a hard time (aka hassle).
Seems as if some of them just can't help themselves.
I'm happy that so far I have not had anything but positive LEO interactions. The few that did speak with me were aware of the legality and had no problem with it.
Since it is very uncommon here I was surprised.