This bothers me, too. I recently signed up for something online, maybe it was a commercial account where I am sometimes a customer - it required an answer for gender, and there were only the standard two options (male or female).
I am not a gender-fluid person or anything like that, I just didn't think they should be demanding to know that fact about me.
Another, more sneaky way, some sites ask the same question is requiring you to pick a prefix to your name - Ms., Miss, Mrs., Mr., Dr. or Rev. Medecins Sans Frontieres where I sometimes donate is one of these. Since the requirement pissed me off, I selected Dr. even though I am not one.
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A finger in every pie.