There's good reason for it. Punjab is the only place (I believe) where Brahmins aren't regarded as the highest caste or even an upper-caste, regarded as middle-caste. Jats are all about hypermasculinity (see where Punjab is situated) whilst Brahmins, to be quite frank, are the complete opposite + there had to be a fight back against Brahmin nonsense and their self-perceived superiority.

The end result was Jats dominating Punjab and dominating Haryana and parts of UP + Rajasthan. Whilst Rajputs were kicked out of Punjab and Haryana + Brahmins are lower in social status. Worked out in the end but now they're too casteist and "proudy" lol.

Kushwant Singh (a Khatri):

"The Jats' spirit of freedom and equality refused to submit to Brahmanical Hinduism and in its turn drew the censure of the privileged Brahman of the Gangetic plains ... The upper caste Hindus' denigration of the Jat did not in the least lower the Jat in his own eyes". The Jat strongly asserts that "Gold does not change its colour for fear of flames", and "embers are, after all embers even though covered with ash"

""He (the Jat) assumed some-what 'condescending attitude towards the Brahman, whom he considers little better than a soothsayer or a beggar, or the Kshatriya, who disdained earning an honest living and was proud of being a mercenary. The Jat was born a worker and a warrior. He tilled his land with his sword girded round his waist. He fought more battles for the defence of his motherland than the Kshatriya, for unlike Kshatriya the Jat seldom fled from his village when the invaders came. And if the Jat was maltreated or if his Wife was molested by the conqueror on his way to Hindustan, he settled his score by looting the invader's caravans ... His brand of patriotism was at once hostile to foreigners and benign, even Contemptuous towards his own countrymen whose fate depended so much on his courage and fortitude", (History Of the Sikhs, Vol. 1, pp. l5f). In fact, the Jats have always "sacrificed their day for our to-day and their to-day for our tomorrow."