Srimad Bhagavatam Canto 10, Chapter 78, Text 23

SB 10.78.23

apratyutthayinam sutam
 akrta-prahvanañjalim
adhyasinam ca tan viprams
 cukopodviksya madhavah
 
Translation: 
 
Lord Balarama became extremely angry upon seeing how this member of the suta caste had failed to stand up, bow down or join his palms, and also how he was sitting above all the learned brahmanas.
 
Purport: 
 
Romaharsana had failed to greet Lord Balarama in any of the standard ways for welcoming a superior personality. Also, despite being of a lower caste, he sat in a seat above the assembly of exalted brahmanas.
Srimad Bhagavatam Canto 10, Chapter 78, Text 22
Srimad Bhagavatam Canto 10, Chapter 78, Text 24