System Exclusionist

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A system exclusionist is an individual or system that holds strict beliefs about plurality and enforces those ideas on others, often in relation to causation. They often seek to exclude other kinds of systems from general plural spaces, believe other systems are faking or mistaken as to their own identity, or otherwise seek to exclude others from identifying as plural.

System exclusionists are not those who believe that DID/OSDD-1 systems should have their own spaces, or that traumagenic plurality is different than other forms, but rather those who exclude others from being considered plural entirely.

History
The term "gatekeeper" originated on Tumblr possibly by endogenic systems. The term has existed since at least 2015 and was most likely coined without the knowledge of the role of the same name.

The term "sysmed" is modeled after the term "transmed", as both follow a similar ideology: a certain phenomenon is only valid if they fit precise medical definitions and ideals. The latter is short for "transmedicalism", and when used as a personal identifier, "transmedicalist". Though, pluralphobia did not come from transmedicalism.

Related Terms
'Gatekeeper', 'system gatekeeper'. or 'syskeeper' is also used as a synonym. System gatekeeping involves gatekeeping other systems' existence, terminology usage, origin, size, pretense of certain headmates, or similar.

'Sysmed' or 'sysmedicalist' is a synonym that refers in particular to systems that apply outdated and misapplied medical ideas about plurality. Sysmeds prioritize DID and OSDD-1 experiences over others, and/or do not believe in endogenic systems. They often disparage "inclusive plural spaces", including saying that DID/OSDD-1 systems don't belong within them.

'Anti-endo' (short for 'anti-endogenic') refers specifically to systems that seek to exclude endogenic systems from plural communities, often believing that trauma is a requirement to be plural.

Controversy
Gatekeeper can also refer to a system role, often found in gateway systems or traumagenic systems, though the term was likely coined without this knowledge. Care should be taken to disambiguate when using this term to refer to system exclusionists to avoid harm towards such headmates.

Not every system uses the term sysmed due to not wanting to compare sysmedicalism and transmedicalism. This can be due to feeling that they aren't able to make the comparison or because they want to acknowledge differences between the two ideologies and histories.

Some systems also feel it may be too close to the term "traumascum" as it was coined with a similar idea, and avoid using it.

Anti-endo is also avoided by some systems due to the origin of the term "endo" (the shortening, not the full endogenic) from system exclusionists.