From the images available I don't think that Carney drank his piss, but it looks like some would have hit his tongue and mouth. I find the comparisons really bizarre.
I also find the comparisons to Shiba really bizarre. Shiba was dropped off to training severely hungover/still intoxicated before our biggest game of the year with a short turn around. He was a mess on the club's time. Walshy pretended to drink from a brand new toilet (also a very odd and lame joke) in his own time. If those calling for him to be dropped or receive a ban actually took note of his snapchat and instagram, you'd know that he is renovating his home with his friend, brother, and cousin (I think), and that he was there while they installed the toilet late that afternoon - he actually gets on the tools too, so could have even installed it with them, so he would be well aware if it was 'christened'. In any case, he would have been punished internally for the shit joke anyway.
Like most of the time Walshy's antics are 0-2/10 humour at best, but also 0/10 newsworthy. Journos stalk his socials hoping for something to ragebait the gunt hauling fans from 17 other teams who hate him because he's hotter, richer, and more talented than them lol. Y'all click that shit quicker than I'd mount Harry and line the pockets of the journos that you all detest. A decade ago this probably would have been ignored, garbage non-events like this are only blasted all over the place because of how people on the interwebs are obsessed with cancelling people. Get the pitchforks out and ride at dawn, you know where to find him, and he'd probably be happy to meet you all ha.
TLDR: Walshy is stupid but harmless, and while he shouldn't have played that prank, you all are obsessed with him, and I'm obsessed too, but for different reasons but it's ok, we're all here to shitpost
Edit: spelling