🚀 go-pugleaf

Here's my take, if it matters a whit:

1.  It's a large corporate chain, so do not expect something not
on the menu.  (iced coffee)  At least they made an attempt.  Now,
how do they correctly charge you on their pre-programmed check
generator?

2.  In a business where the typical bill is so small, a check is a
rarity and a hassle to deal with.  It may be in a place like IHOP
that the majority of checks are written by those with no funds to
back them.  If the tip is included in the check, and the
establishment pays the server the cash, is the restaurant then
directly out the cash for the tip?

3.  The only actual mistake (yes, mistake, HUMAN error) was
unfortunately bringing an incorrect beverage to your other half.
The horror!  Perhaps the allowance for a simple error certainly
not borne of hostility would be in order.  These folks are not
working there for the fun of it; they're just doing their best to
earn a lving.

My guess is that you started off in a less than stellar frame of
mind, and this was a thing to focus your malice on?  It was enough
to purge the feeling by the time you got to the other restaurant.