If it's only prejudice. Perhaps his family suffered greatly in some yakuza related case. Naturally it would have absolutely nothing to do with Jun, but human mind is not so simple. Or maybe he just is a big jerk.
I found it funny how, when I bought a macro lens, it cost more than the set of my camera body + basic lens itself (though I got a good discount when buying my camera). But then again, back then there were multiple tiers of DSLR cameras from entry to hobbyist to enthusiast to professional. However, there were only two types of macro lenses in Canon's own selection, so even the "cheaper" one was quite expensive. Not to mention macro lenses aren't probably the most sold type of extra lenses.