GymLadTim, the reason you've found hostility on this thread is because half of the members are probably thinking "Oh ***, that was me last weekend emptying my colostomy bag in public outside greggs", that, or they can relate to the situation because they have their own colostomy bags.
I personally think emptying a colostomy bag in the street says two things. One, the person doing it is clearly not very good at planning, or foreseeing the future or knowing how full their bag is before having another drink. Two, they clearly have no shame.
If it was down a side alley, a shopping centre toilet, a restaurant toilet, a park or even out behind a bush somewhere, it'd be different to pulling over in the main high street, and pump and dumping literally in a road drain.
It is illegal to dump or discharge waste or pollution into storm drains (das wat dey are) so well done Tim.
Everyone on this thread is thinking of the poor guy who had to empty his bag... I think anyone emptying a P bag in the middle of the road is probably a drunk. Heck, the reaction Tim has described almost proves he was a drunk, if he had any shame he would have been mortified, not aggressive.
People have nit picked the words you've used in this thread Tim but if i was shopping with my mum, girlfriend or grandparents then i would be appalled to witness such a public display of in effect, urination.