Because he can't do a case-sensitive match for the offending URL using whatever rewriting tool he has available on his server?
If there's only a small number of URLs involved then sure, you can redirect them to the correct form. In Apache it would be done with a RewriteCond checking for at least one upper-case letter in the URL as requested. But Regular Expessions don't have case-changing built in, so you can't say "take any input and change it all to lower case". For that you need some kind of outside script. Unless, ahem, your name is jdMorgan.