Gith became resistant to the mind control over the millenia. This is why in 5e the race has psychic resistance. The duergar were also slaves of the mind flayers and this is why they have psionic fortitude. There’s some other races that have been altered due to being enslaved (derro, kuo-toa, quaggoth), usually resulting in some form of psionics and madness.
Part of what makes mind flayers interesting because their society touched and left scars on a lot of other races. Gith are just the loudest about it in part because they live in the Astral Sea where time doesn’t age them so, outside of dying during raids, many of the gith who rebelled can easily still be around leading to the rebellion being fresh in the gith’s minds (as opposed to the duergar for example who live on the material plane in normal time and have had empires rise and fall and numerous generations since the enslavement).
Swapping my own group to PF2e and we’ve all played other systems (lancer, sw saga, vtm, cyberpunk, kids on bikes, etc). I do think if a meme says something different than DnD (using it as a generic term for TTRPG) you’ll get more people commenting on the system rather than relating to the meme (like if this said Traveler there’d be more comments about never played Traveler or if it said PF2e comments would be more about the system war).