Lol, as if Buddhists don't have social divisions and the so called upper-class supremacy. There have been 28 Buddhas, till now. There's not even a single Buddha, who was from lower caste. Why so, dear rakshasha? https://twitter.com/KPSharmaOli15/status/1343206089173520384

All the 28 Buddhas were either Brahmins or from a highly placed Kṣatriyaḥ lineage. The prophesied future Buddha, Maitreya, is also said to be born in a Brahmin Family.
All the previous incarnations of Śākyamuni Buddha (or Gautama Buddha) were either Brahmins or Kṣatriyaḥ.

The buddhist Pali scriptures also enumerate the quadrupled divisions of society or the Varṇa system. It's called in Vaṇṇa in Pali. There is direct evidence in the suttas that the Buddha recognised caste distinctions.

In the Kaṇṇakatthala Sutta (90) of Majjhima 4.10 (II 128-129), the Buddha, addressing Pasenadi, observes that there are four castes, khattiyās, brāhmaṇas, vessās and suddās.

An excerpt from chapter 13 of Lalitavistata Sūtra, talking about purity of family bloodline & their worthiness for a Bodhisattva’s birth and outcastes.

In the Madhura Sutta (84) of the Majjhimanikāya (II 4.4) and in the Assalayāna Sutta (93) of Majjhima (II 5.3), the Brahmins claim to be of superior caste (Brāhmaṇo seṭṭho veṇṇo) and the rest are of inferior caste (hīno aṇṇo vaṇṇo).

Buddhism also have concepts similar to Yajñopavītam. In Buddhism, the Upanayanam is referred to by the Pali term, “opanayiko” which is one of the six characteristics of the Dharma.

So my dear rakshasha, how's Buddha against brahmins?