@Workyticket
YANBU to feel aggrieved that someone assumes you will do it, without asking you first. That's just common courtesy.
But YABU to say 'I don't wanna do it/I ain't got time/I can't be arsed, as I am too busy. It will take ten minutes. As has been said, I bet you spent more time on here today. And the 'I am not working so can come on mumsnet for as long as I wish' line doesn't wash. You are literally contradicting yourself, and making yourself look a bit daft with your 'I simply don't time TIME to do these references!' waffle.
This puts me in mind (a bit) of my friend who wanted her specialist/consultant, who deals with her chronic illness, (8 weeks ago,) to supply a supporting letter for something. She was told by the person she spoke to on the general enquiries line, to email in to them and they would pass it on to him.
She enquired after 2 weeks as she had heard nothing. The general enquiries person said she needs to wait 'a few more weeks,' as because of covid, he was behind. (Covid is the most convenient excuse for everything these days!) 
5 weeks went by, and nothing. So she rang and asked to speak to a supervisor on the 'general enquiries line.' They investigated, and it seems that 2 weeks after she emailed in, he had informed his secretary to tell my friend that he doesn't do this kind of thing, as he simply doesn't have time. 3 weeks after he said this, they finally got round to telling her. AFTER she had pushed them for an answer!
tl;dr ... Just illustrating an example of how someone else thinks they're above doing something simple for someone to help them. That letter would have taken five minutes to type. Nearly 2 months on, and my friend still hasn't got anyone to do it, as the GPs are currently too inundated to do it ... (because of Covid obviously...)
Yet, the doctors (AND the specialists/consultants,) are seeing hardly anyone, so fuck knows why they 'haven't got time.' Can't be arsed more like. Like the OP!
Also workyticket you asked AIBU - and many people say YES you are! And you're like 'no I'm not......!' 
WTF was the point of posting this, if you're just going to say that everyone who disagrees with you is wrong? 