Vaishnava Samhita. Raskhan Charitam. Vol III Book VII Chp 13 Shloka 11

वर्णाश्रमकुलाचारं कलिकल्मषपङ्किलम् |

अतिक्रम्य विशुद्धात्मा केवलं वैष्णवो भवेत् ||

Caste system and codes of conduct attached to the strata of birth have got marred by the malady of the Kaliyuga. Hence giving up all these, one should become a pious vaishnava