Perhaps your lawyer tried to explain the reasonable person standard to you - that if a reasonable person would be offended by something, in certain context the speaker's intention can be irrelevant; but we're talking about a reasonable person, not an individual's subjective impressions that may reflect significantly heightened (or lowered) sensitivity. But if the so-called harassment does not relate to a protected status, it's something for your employer to deal with pursuant to its personnel policies. That's a long way from justifying a lawsuit - which would presumably be why the lawyer offered to let you pay him to send a letter rather than signing you on as a client on a contingency basis.

