I am actually not sure that this is an example of bias, at least not in the direction that you seem to be implying. Though I appreciate your strong connection to the subject, the purpose of the Wikipedia page for a topic is not to advocate, but to describe. I don't think it is very controversial to say that the term "feminism" has a more widespread common understanding than the term "men's rights." I empathize with the desire to have a place to put information about issues that affect men, and also with the frustration at being told that the correct place to put that information is under the heading of feminism. But I do not think it is unreasonable for the Wikipedia page on "men's rights" to discuss the various ways people use and understand the term, the history of its use, and criticisms.

I wouldn’t patronize the GP. They described a double standard which can’t be dismissed by therapy talk / an appeal to the mainstream.

Rather, there’s a real political legitimacy behind their frustration as the election has demonstrated. The GP's experience ought to be documented carefully and posted in a blog for others to learn from.