[@Penny]

[quote]Now assume that you had a male nurse whose co-workers consistently called him by a female name (not his own). He has made it clear that this is unwelcome and offensive. He has asked them to stop and they continue to do so.[/quote]

What you have described is man whose colleagues are jerks, not a title seven violation. They may or may not be in violation of a company policy but the law requires unwelcome sexual advances, requests for sexual favors, or other verbal or physical conduct of a sexual nature for a given behavior to qualify as sexual harassment. 

Furthermore the situations being compared are not the same. In the example you give a man is bullied by his colleagues, who address him with a name that is not his. But that is different than a situation where one individual makes a claim (that they are a certain gender) and those around them do not believe their claim and elect to not behave as if it is true.

[quote] That is clear cut workplace bullying and sexual harassment and practically any HR officer would agree with that.[/quote]

The opinions of a human resources department are not relevant.