Fisherman is a funny one. We can neutralise police officer, fire fighter but fisher person feels all wrong.
Angler covers it.
Yes, exactly. There's already a perfectly normal word in existence to describe somebody who goes fishing for a hobby, that has no hint of sex/gender or anything to it. Sam is deliberately attention-seeking and looking to create a problem where there is none.
In fact, Sam is going further and deliberately appropriating a term that is understood by native English speakers to refer to an actual occupation and livelihood, not just a professional singer's hobby. Just like I can't style myself as a popstar, because I like to warble in the shower.
If you referred to some celebrity with, say, a racist slur it wouldn’t become acceptable just because they will never see your text.
You do realise that 'he' and 'she' are not insults in any way - they are just very minor parts of standard grammar? Most people use them instinctively and don't give them a second thought - like the words 'on', 'for', 'to' and 'in' - it's only the trans and NB people who insist on making something massive over a trivial mundanity.
And now a university in the UK is telling students to use "they" pronouns for everyone, until everyone has told them what pronouns they want to be used for them. There is no end to the purity spiral.
I have no problem with the singular they when referring to somebody theoretical or of as-yet-unknown sex; but I do not want to be referred to as 'they' by somebody who can very clearly see me and observe my unambiguous sex. To refer to me as 'they' in this context is misgendering, deliberately slurring and (to use their own language) 'actual violence'.
Like with the 'cis' slur, I am vexed and offended when people in these minority groups assume to be freely able to refer to me by using their own belief system - even trying to slap me down and tell me how 'wrong' and 'troublemaking' I am if I object - but I am not freely able to refer to them using my own basic traditional knowledge (call it my belief, if that makes you feel better). All of the screaming about wanting equality and it's nothing of the sort: it's seeking special privileges and assuming the right to redefine words when it suits them (but not when it doesn't) to fit their agenda.
To be honest, it is showing people a lot of respect when we tactfully ignore them in their attempt to enforce their ideology on to us, when our more justifiable reaction would be to hit back (not physically, of course) at them seeking to ride roughshod over ours and arrogantly make out that they are special, unique people whilst we are nothing more than nondescript walking stereotypical clones.