Yes, Barwa/Baroe were hostile to Bakalanga.

And so the Tswanas/Sothos are junior to the Kalangas, after all. The official Graham Hancock website, describing how the Two Lands of Upper and Lower Egypt were possibly weighed and divided (as the Egytians themselves claim)  in order to achieve peace between their gods Seth and Horus respectively, notes that:

“…In the First Time peace had reigned, before the dispute in which the visionary young Horus was blinded by his uncle Seth, while Horus castrated the worldly, virile older male. For the Egyptians, from at least the time of the Pyramid Texts, this dispute was a mythic equivalent of the opening of Pandora's Box, by which troubles came into the world…”

The Graham Hancock website quotes  an inscription on the Shabaka Stone:

“He judged between Horus and Seth; he ended their quarrel. He made Seth the king of Upper Egypt in the land of Upper Egypt, up to the place in which he was born, which is Su. And Geb made Horus King of Lower Egypt in the land of Lower Egypt, up to the place in which his father was drowned which is "Division-of-the-Two-Lands." Thus Horus stood over one region, and Seth stood over one region. They made peace over the Two Lands at Ayan [location immediately to the north of Memphis]. That was the division of the Two Lands….Then Horus stood over the land. He is the unifier of this land, proclaimed in the great name: Ta-tenen, South-of-his-Wall, Lord of Eternity. Then sprouted the two Great Magicians upon his head. He is Horus who arose as king of Upper and Lower Egypt, who united the Two Lands in the Nome of the Wall, the place in which the Two Lands were united.
Reed and papyrus were placed on the double door of the House of Ptah. That means Horus and Seth, pacified and united. They fraternized so as to cease quarreling in whatever place they might be, being united in the House of Ptah, the "Balance of the Two Lands" in which Upper and Lower Egypt had been weighed.”

Of great significance in the above quote is the word “Ta-tenen”, which is a corruption of the Kalanga word “(Ba)Tatennini”, meaning a paternal uncle, i.e. one’s father’s younger brother. So to the god Horus, the god Seth was Batatennini, meaning that the people of Su were considered junior to the people of Lower Egypt. But who were these people of Su?

From the Southern city of Su, we have BaSuThu, i.e. “People of Su.” These are the Baroe/Barwa, whose god Seth (Sotho?) was an uncle “Ta-tenen” i.e. Batatennini in Kalanga language, to the god Horus of the people in the Northern city of Memphis. So Horus, son of Osiris, was the god of Kalangas in Lower Egypt.

Now we know what the name “Mosu”, a village where Khama III is said to have been born, means – a person from Su. I recently read an article by Michael Dingake in which he warned Bangwato not to attempt to re-impose their oppressive Mephato (regiments) on “subject” tribes. Dingake remembers that Bangwato used to call his father “Rangwane” i.e. junior uncle. Imagine the cheek of rangwane calling rremogolo “Rangwane”!  Unless Bangwato occasionally put on their Bayela (Kalanga) mantle to tamper with their BaSuThu roots, it makes no sense that they would refer to a Mbikhwa (Dingake) as “rangwane”.