Most people I actually know are content with 'he', 'she', 'they', or 'it' and varying forms thereof, but I imagine somefolk went through trying out invented neuter genders before settling on those the same way I tried to learn several constructed languages before realizing how few people I'd actually be able to speak them with.
... I am aware of someone for whom 'robot' would be a valid expression of some states of genderfluidity (not otherkin, just somehow best way found to express gender settings), and seeing the people trying to be inclusive and not trolling dismiss that as only possibly a joke entry was a mite disquieting.
Joke entries are great, particularly for those of us who don't feel comfortable sharing things like location or gender, and I do like the idea of a blank entry field. Can wind up with joke Identity: Otter, furry Identity: Otter, evasive Identity: Otter, or whatever. Between demicisexual friends who'd rather not be perceived as their genders online, genderflexible friends who'd rather present as whatever gender perceived as, and uncertainly trans friends who might not be entirely comfortable completely distancing from assigned-at-birth gender, joke entries can play a really useful role in terms of being able to safely express or not express gender while diffusing it with humor.
That said, there's a difference between claiming something silly as your identity, and trolling by insisting on pronouns you don't actually want and your disguise being imperfect enough for the trolling to be perceived. One's in good humor, the other's parody, and being hurt by being parodied is ... well, it's what happens. Someone who expresses their gender as 'robot' is likely going to appreciate they can do that more than worry that other people will do it in a silly fashion, but someone who has decided xe can't use 'it' or singular 'they' (due to the associations with 'it' and not getting confused with reasons of plurality for 'they', perhaps) would be entirely justified in being hurt by a parody of invented pronouns, even if xierself bothered by the proliferation. (Which considering I kind of made up the forms of that I might have just contributed to.)
Kind of similarly to how it's reasonable to bother me by parodying someone who claims to have Asperger's Syndrome (now Autism Spectrum Disorder) as being self-diagnosed until proven otherwise. It's like ... no, damn it, I got that diagnosis from a psychiatrist, and it isn't perfectly accurate, but enough parts aligned to be relevant and the diagnosis helped with my life in terms of legally forcing people to be a bit more patient with how my mind's different.
I might be frustrated with people who self-diagnose, too, but considering I didn't get that diagnosis until later in my teens myself, I have sympathy for folk who are going through 'what the fuck is even wrong with me maybe it's this' and can't get it figured out by an actual psychiatrist for whatever reason. I've been through that, tests clearly showing something's wrong, just not what.
Or, heck, bisexual erasure, or 'there are no women on the internet', or anything else that directly subverts what I know to be true. I can think of plenty of situations where my own identity has been marginalized, dismissed, or mocked; considering things like the higher suicide rate of bisexual folk than straight or gay ... treating someone else's experiences with respect rather than those things might be gravely important, even if I do not understand what's going on.
