Wow… This is not a hard concept, and you are really struggling to comprehend it.
The definition does not say divided by “race or caste”… it says “separates people according to race, caste, etc”.
Those are commas, not the word “or”.
And, that little “etc” you left off? It is word that has a meaning.
The “Medical Apartheid” 🛑 “Vaccine Passports” sign is clearly protesting segregating the citizenry by the ability to prove vaccination status.