It seems a davar pashut that menschlachkeit demands one say GS to anybody one meets, lest one think religious Jews are unfriendly.
The same would apply in an office. One can’t only talk abot work related matters. One must be friendly and ask where are you from, and say Oh, that is a great city, I visited it one time and I saw XYZ, etc. One must be warm and outgoing to all. There is a big difference between friendly conversation and improper conversation. One can do the former without the latter.