I do agree that no-one is too busy to do a certain task if they really want to do it... Like when someone doesn't text back, it's not because they are too busy, it's because they can't be arsed. If someone can't come with you to a hospital appointment in 3 months time (so with 3 months notice,) it's probably not because they can't - it's because they don't want to.
That said, you are entitled to say no to anything you want to say no to, and to refuse to go anywhere or take anyone anywhere if you don't feel like it. Eg, someone asked me some months back if I could take them to a hospital appointment - one that was going to take the entire day, including getting there and back, and the potential 3-4 hours in there.
I said I can't because I have plans that day. 'What plans?' she asked. 'Well it's a bit personal.' I said (unable to think of anything!) 'Well I will change the date then' she said. 'Just let me know what days you AREN'T free in the next 2 months...'
The hospital was 40 miles away, and I actually ended up saying 'I am really sorry but I am actually scared of driving, and won't drive any further than 10 to 12 miles... (that distance encompasses my workplace, and my family and friends.)
Yeah I know, pathetic. I just find this woman REALLY high maintenance, and only OK in small doses (like a 5 minute chat once a fortnight!) and I did NOT want to spend (potentially) 8 hours with this woman. I would have gone out of my mind. It's bad enough waiting for hours on end at hospital with someone you actually like, and want to be with!
As a few posters have said, no-one has a right to tell you how you should be spending your time. If you have a day off, and want to spend it on netflix, and pissing about on mumsnet for 6 hours, and not spend those 6 hours doing stuff for others, that is your prerogative.
And regarding buying something online... why on earth WOULDN'T you, if it takes 2 minutes to do, but would take 2 hours if you went to the store?
I renewed my car tax online a few days ago. It took 2-3 minutes. If I had done it at the post office, it would have taken a MINIMUM of an hour including getting ready and waiting in the bloody queue, plus petrol, and wear and tear on the car. Why do that when I can do it online in a couple of minutes, without leaving my chair?!
@Undies1990
YANBU.