as long as he went down the garden away from people i wouldnt be bothered tbh, he announced it because he was drunk no doubt and found it humorous. maybe there was a queue for the toilet?
i remember being about 17? and having been to a party and then having a lift home, it was a long drive back and by the time they dropped me off on the RAF housing estate i lived on i was BUSTING and so cut across the park and found a bush to wee behind, it was about 3am so i figured no one would see me, only i forgot about the RAF police patrols, who walk about, who did see me, they laughed and said 'good night then?' and indeed it had been a good night.
as a general rule no i dont pee in the garden but on a country walk if caught short then yes i would and have done when pregnant.
pissing in the street is not the same and yes gross, but in a garden, in a bush etc out the way i dont see it as a big deal if you ahve to go you have to go.
oh and yes wee is meant to be good for compost etc, i remember emptying the potty into our compost heap when we had one, wees only! but it was meant to be good for it and my grandad encourages my boys to wee on his compost heap etc.