I’ve seen enough posts related to etymology or historical use of words where they, either misrepresent the facts to fit a narrative or just make shit up, that I try to look it up my self. I also find etymology fascinating so that helps.

In this case they are absolutely right.

Both Mr and. Mrs,ms are derived from master and mistress (teachers) and both of those words stem from the Latin word Magister.

Edit: fun fact the English verb stick is the same word as the noun stick and comes from the same origin the Germanic word stik which also meant a piece of wood and to pierce/adhere or sharp. But wait it’s older than that the Latin word stigare also means pierce. And share the same ancestry, namely indo-european. Turns out we humans have been talking about sticks for a long time.