Can anyone tell what's history of "jokes" made on Pathans?

Please don't misunderstand me as I am not intending in any way what so ever to offend anyone. It's just a query as I don't see much jokes related to other locals like Sindhis, Punjabis, Balochis etc.. so why it's just Pathans? Is there any history or propaganda behind it? Please let's not be vexed by thinking bigotedly.

Bindas, can you help in this regard?