Why bother?

I got a response to crit I did some time ago this morning and it has left me a bit flabbergasted. In it the person takes a suggestion I made (as part of a longer crit) and picks it apart completely to show me why it is wrong beyond wrong and they will not be using it.

Sorry! I thought a crit was a request for an opinion. I apologize for actually giving mine. (Actually, no, I don't.)