I'm guessing this might have been done to death so apologies if I'm stirring up old territory!
I'm all for paying for what you eat/drink when there's a big difference, like an extra course or significant extra alcohol consumption.
Just before Christmas, about 10 of us went for a meal to celebrate and old member of the group who had moved to the states and was back for 2 weeks only. This member and her boyfriend plus 2 others shared a bottle of white, everyone else had soft drinks or had ordered and paid at the bar before we sat. We each had one course.
At the end of the meal, the bill came to dead-on £150 (inc. tip), most of us had put in £15 each when one couple said actually they want to pay for what they ate as they didn't have any wine. A few people pointed out the difference would be pennies as they had 2 soft drinks each. The couple were visibly very offended, and we could see them chat to each other about how ridiculous the rest of us were.
We all took back our cash, and started passing around the receipt to work out who should pay what. After all the fuss, the couple in question actually spent more than the wine people, bringing their total to £31ish including tip.
One of the other guys in the group then said something along the lines of 'you guys just talked your way out of £1' and their answer was that actually, they don't want to pay a tip, so are just going to pay £30 any way.
A couple of us then chipped in another 50p each to cover the damn tip and the couple remained in a sour mood for the rest of the evening.
So...
AIBU to just want to split a nice round number when we've had a nice evening instead of all this rigmarole?
I ask because they want to meet up again in 3 weeks time and I'm not sure if I can be bothered.