A high Sylheti government official was once addressing a gathering and I was attending that. At some point he was saying,"There are many tribal population in Bangladesh, Like Sylheties (He realized he made a mistake, after a second of pause he started like chakmas, marmas etc etc...." It's off topic but a bit relevant to the current discussions allowed by the mods
I fail to actually understand how / when such slip of tounge takes place, is it because of believing deeply that Sylheties are some tribe? Don't know if the Sylheties believe so.