I'm not looking for insults per se, only slang used to describe different types of sickles. I'm not encouraging anyone to use these terms either. I'm just doing some research for a writing project.
Japanese bikes are sometimes referred to as rice burners I guess. That's the only one I know. Some of the specific brands have their own nicknames - Trumpets for triumphs for example, Dukes for Ducatis and so on, but I don't know if your looking for that anyway.
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I use Duck for Ducatis
Goose for Moto Guzzis
Trumpets for Triumphs
Cow for Kawasaki
A$$ Jewelry for custom choppers and cruisers
Bimmer for BMW
These are terms of endearment for me. I don't like to slam other people's rides.
i call most japanese racer reps that i see on the street (r1/gixxer/fireblade) "squid bikes" because they are almost the exclusive provenance of. . . well. . . squids
My friend and I refer to his beemers as panzers. I refer to street/race style bikes as crotch rockets, donorcycles, dummycycles (depending on the behaviour of the rider). I call my triumph a trumpet fairly often. When I ride with my friend and his brother (former Kawa rider, current BMW rider) I often made jokes about them being the Axis powers. Now that he's riding a german bike as well, Battle of Britain jokes.