Maybe the shirt isn't 'PC' but it's also just an ugly shirt. No need to throw a temper tantrum about someones terrible taste in apparel. Just seems petty to me to decline sharing your knowledge with people because you are easily offended. I don't think it's a detriment to women as a whole, but certainly to an individual who is willing to opt out of educational events because of a shirt. Imagine if every woman adopted this attitude, the end result would be less women at these sorts of events. I don't see that helping anyone's cause.