... "there is no evidence in the Rigveda for an elaborate, much-subdivided and overarching caste system" [1]

Caste and any discrimination is abhorrent, and like others have commented is a more recent phenomenon. In old times and today, anyone can become a priest/Brahmin by learning. [2]

1. Same wikipedia page

2. https://timesofindia.indiatimes.com/city/amaravati/first-bat...