Some individuals will argue Pakistan and Iran share great history, language similarities, culture, poetry, culture, neighbors, etc all well meaning and understandable points.
However, on the personal aspect between Iranian and Pakistani people there isn't much interaction nor affinity that this supposed "brotherly" or at least "friendly" ties would mandate. Many Iranians I've come across think of Pakistanis as "fanatical Muslims" and "extremist" doing exactly what some ignorant westerners or easterners may do and that is paint Pakistan with a broad brush, we all know Pakistan has more depth than that.
Now I'm sure there are Pakstanis who have an unfavorable view of Iran and some who like Iran. Though, again this "brotherly" or "friendly" aspect in Pakistan and Iranian relations is absent.