[paradox242]

I read this as a warning that while people at work may be "friendly" with you, they are not "friends", necessarily, though they certainly can become them. This means that one must be careful confiding certain comments or thoughts with people who are friendly, or you may find yourself thrown under the bus or find this information enter the public domain at your workplace. Young people may be particularly primed for this oversharing, and I think the warning is that it should always be carefully considered.