Beyond this just naturally upsetting me, it also makes me a bit sad. Sometimes rules can seem trivial, but apparently Disney has this rule in place for the benefit of the patrons staying at each resort. I know I do appreciate the rule!
We stayed at CBR in May but had a lunch reservation at Beaches & Cream at Boardwalk. My two sons, 4 & 7 years old, just loved the pool and begged us to go. My husband and I explained to both the boys that we were not staying at that resort and that it was only for those staying there.
Some people obviously think the rule is silly and disregard it. For us, we like to be respectful of other Disney goers.