My inclination is to share the opinion of Logic some pages back: we are here because we enjoy the sport, we only have the sport because there are riders (and we all know the risks and hardships that riders face, as well as the rewards) and so we owe them a basic respect, even if we don't like them.
Ally that mindset with the sense that once a joke ceases to be original it serves no purpose, and therefore I am somewhat bemused by the sense that it is of value to continue it (we have all stopped calling Indurain 'Singing' haven't we?)
I don't like the attitude that other people's irritation is of no relevance when the thing that causes it is gratuitous and unnecessary: I don't want to cast aspersions on those who have suggested otherwise in this discussion (I know nothing of your personalities outside of here), but the attitude strikes me as dismissive and arrogant.
So that is where I am coming from, but my position here doesn't mean that the forum runs to my mores: I want to serve, so I bear in mind what is said, while asking that people exercise consideration and restraint.
But that does not mean that there is open season on calling anyone anything: I liked ToS's categorisation above.
First THANKS Armchair for your continuing efforts
Abbreviations: that don't offend should be allowed - e.g. Pog, Vingo, Cav, G
they make rapid forum exchanges possible without making embarrassing spelling mistakes.
Externally recognized nicknames: Chicken, Shark, Dawg , Condor must be okay too.
Descriptive neologisms that emerge in the forum are part of our joy e.g Pidders - okay if not offensive or in bad taste.
Border-line cases:
Skeletor - you can actually see his ribs, like Chicken
Loudmouth - only if he/she actually shouts
Offensive triggers: Death/Mort Jerk Idiot ... and worse