personalities

Memeticists often define an individual's mind as a “playground for
memes” or as an “ecology of memes”, where the different memes that have
colonized that mind at different times interact with each other. For
example, when a mind successfully infected by the memeplex for religion
X becomes exposed to the memeplex for religion Y, memeplex X may
repulse memeplex Y: X can block Y from infecting the mind (for instance
through use of such memetic components as the meme that “all other
religions besides X are evil”).