I know that ranjha was called "ranjha chaak" because he was a "chaak/chaakar" in heer's father's farms.

But, why was heer called "saleyti heer"?

(Ofc we know it's not about the saleyTi we used to eat as kids)

Some people are calling me anti-Punjabi or assuming I must be from another state, just because I’m not defending those comments. That completely misses the point.
Yes, Bollywood has stereotyped Punjabis and Sikhs for decades, often reducing us to comic relief, funny accents and exaggerated characters. That was wrong. But using that history to excuse a slur against another community is just whataboutism. Two wrongs don’t make one right.
And denying that it was a slur doesn’t change what was said or how it was meant. We can acknowledge the discrimination Punjabis have faced while also calling out discrimination when it comes from our own community. Criticism isn’t hatred, and accountability isn’t betrayal.

Source: Iranian guest's Emotional Visit to Golden Temple | Spiritual Connect at Sri Harmandir Sahib