I have some knowledge in a specialized area of manufacturing products, for ease we will call this "machining" but I do reference something specific for this post (more specific than the typical "general" usage of the word."machining.")

People who do not work in my industry constantly tell me how to do my job, incorrectly I might add. I also happen to be a cis male. I'm not convinced this is a gender specific thing, I'm very certain of mine, and "mansplaining" as described by you happens to me, when supposedly it should not due to my gender.

So I suppose I ask, does it go from simply "confidently incorrect" to "sexist asshole" simply because the person was talking to a woman? Is it then misandrist when the explainer is a woman and the explainee is a male? "Confidently incorrect" can then only be accurately applied if both parties identify as the same gender, otherwise it is [gendered prefix]-splaining?