Ah, these pissing matches. I have been involved in them a few times, and the most diplomatic way to end them goes like this:

1. Say that your choice suits your needs (user-replaceable battery, able to use any network you like, actual keyboard, etc.)
2. If you are getting the same capabilities for lower price, highlight that.

Also, try using http://touch.facebook.com instead. In general, I use the mobile version of the site to save on my data transfer allocation.