Regardless of your saying' "willy waving" is an expression used a lot on our local expat forums here.' to write ' gweilo "willy-waving"' certainly appears to be abusive. You do not even try to explain whether "willy-waving" is directed at both men and women and whether it is an insult aimed at someone because you disagree with what they say or male bravado. It is difficult to think it would belong to women.
This thread was started by a Chinese person and was taken to be a genuine thread. As I am the only non Chinese person to have written on this thread, I can only imagine that this is directed at me. If you have an issue with something I have said, I suggest you address it rather than coming on with what certainly appears as abuse to me.