What is your spin on this situation

A 4 hour casual wedding reception.

No alcohol.

Close to 200 guests.

432 cans of pop/soda in a variety of flavors.

2 hours into the reception, one flavor has only a few cans left.

There is still plenty of pop for the remaining 2 hours.  Over 200 cans in a variety of flavors.  Plus coffee.  Plus tea.  And guests are already slowly departing.

The Father of the Bride feels there is just not enough pop and leaves the reception to go purchase more.   He needed to go buy more.  He HAD to go buy more.

After the reception is over, there is close to 300 cans of pop left over. . . . . . . not to mention the dent in the reception budget.

These are the sort of battles that plague me.  Leave him alone to do his own thing versus I knew what I was doing, I had it under control, but he bulldozed over me and did what he wanted anyway.  

I chose to enjoy our daughter's reception.  He had to get pop, he went and got pop.  Oh, how not to stuff my feelings, oh how to live with this stuff.  Oh how not to lose my sanity.  

Yes, I wanted him at the reception.

Yes, I wanted him to ask someone to help him.

Yes, I just don't get it.  

I would like to think if we were independently wealthy these things wouldn't matter.  But we are in 10's of thousands of dollars in debt. And this is the sort of spending that messes with our finances every time. 

And I don't know the steps to handle these situations when they arise.