Insisting that nominative pronouns must follow 'be' ignores what "fact"? The "fact" that it sounds absurd to you? It doesn't sound absurd to me, so is it still a "fact"?

Jennifer is right. Just because something sounds funny doesn't make it absurd or snobbish or wrong. When it sounds funny, check out the rules. If you don't like the answer, too bad.

People don't like to find out that something they're accustomed to is technically wrong. So what's the reaction? Declare the rules are wrong and decide that what sounds right to them is correct. So we all now have our own personal grammar rules.....great! Grammatical Relativity.

Jeez - have some humility!