I'll get some flack for saying this but genwunner. The pun is just so lame, and triggers me to picture a bully in school who can't spell his own name making the shape of the letter G with his fingers going, "Doy, day, duh, loser u a genwunner haha! Yea I'm gunna kick your ass!"
The word genwunner is also almost never used in the context it is supposed to be for, somebody who has a very narrow experience of Pokemon, restricted to the first generation, and is generally unfamiliar with or hostile to anything outside of the 150 Pokemon they grew up with.
If someone makes a criticism of a pokemon game that you like that is not the same thing, but from my experience that is usually the time when the word gets tossed around around defensively. Its just a name to call in an attempt to shut down conversation and discourse because you don't like what someone said I.e Genwunner Alert! Ironically, you are demonstrating the closed-minded mentality you project onto the "genwunner."