You would be surprised what Karachi boys who are educated think about rest of these Ethnicities, they don't say it out in open forum but if you talked to them private gatherings you will know, I study in 1 school , 2 colleges , 2 Universities. The resentment against them is very common, and I was also delusional at first who used to think that we are all Pakistani's blah blah, But I remember when Operation Started against MQM, and they paint the whole Karachi as MQM supporters, and many urdu speaking boys were beaten up just because of wearing jeans, their eyes and ears were shut with Elfi , almost 30% of Karachi become inaccessible for boys like me. And than we had PDF, to this day people are so hateful in their behavior that they compare MQM with TTP, MQM was bad but no way they are at same level as BLA/TTP etc.
I live in Gulshan, You know why their vote is gone ? Because of their own BS not because of that Pastoon's, Punjabi's Sindhi or Balochi become nicer, back in the day I would dare you to go to Kati pahari in night with your family, or Liyari or Afghan Basti or Al-asif square, or Purani sabzi mandi or mausamiyat , your family would be robbed harassed and you would be lucky if you guys come out alive, but back in the day you can walk with your cell phone in Aziza bad and you won't get robbed or no one misbehave with your sister or women, MQM guys were criminals, mobile snatchers , bhatta khors but they never misbehave with women like the rest of these Ethnicities, Misbehaving with girls during robbery becomes normal when Saraiki gangs start coming to Karachi, and Pathans who even don't care about putting their hands on women's chest to grab necklaces, I grow up on the ground level, saw everything , experience its , talked to people who experienced it, and this why I believe that rest of the Pakistan is nothing but jungle, Karachi was far better before Tribals, Saraiki , Balochis , Sindhi's came by, they turned the city like their Abai Areas and now they are proud.