Athletes are gameplayers who play sports games.

From STEM, an abbreviation short for "Science, Technology, Engineering and Mathematics", a STEMlord is a pejorative term for a particular kind of person who has studied in these areas at university or works in these fields who holds a pretentious, condescending attitude to anyone who has studied in any other fields, particularly the Arts and Humanities. They typically believe themselves to be more "intelligent" and "rational", while generally remaining incredibly ignorant outside of their areas of expertise and having the charisma of a rotting pig's backside.

a gay teenager who constantly refutes that he is gay, often by screaming like a mental retard

A person that plays games, like mind games with others

A person who is filled with deception and dishonesty. A person who mis represents their intentions.

a gay teenager that is friends with killer,that constantly gets offended if the word gay is used

A "game player s" is a person who desperately tries to destroy a message board. More specifically, message boards related to video games.
A "game player s" has been said to love video games, but hates anyone else who gets near them.