Why do hindus say pakistanis are low caste?

Why do hindus say tht pakistanis r low caste converts, whereas 80% of the pakistani panjabis r jatts, rajputs, gujjars etc. who belong to the warrior khatri caste originally and r in noo way the lowest caste, infact the second highest, and 15% of punjabis r persian, afghan and central asian settlers,ancestrally, and only abt 5% of the punjabis r low caste converts, 2% of whom r now christians, not even muslims, then y do they hold these fake bs against us? is it to do with jealousy? why would they deny these facts just to brand us as "low caste", not tht im saying caste even matters, maybe it does to hindus, but then they shudnt twist facts.....