Your mistake is thinking that the issue is whether or not the claim is flattering. The real issue is, whether or not the claim is supported by unbiased evidence. If you claim women have innately better language skills in a society that is female dominated, you would indeed be sexist, if you cannot support the claim.
Hang on, a moment ago you claimed to be merely posing a question, but now you are admitting that you "suggested" something. To that we say, yes, we know fully well that you were suggesting something. All we were pointing out was your absence of supporting argumentation, and how fully the evidence that was mentioned in this thread demonstrates the answer to your question. It's asked and answered, why would you not simply face that at this juncture? You see, if sexism and ignorance were not rampant, then there would probably be no cause for offense, as you say. But they are, and far moreso than the dreaded "political correctness".