How left handed kids are treated here ?

I was shocked when one of my friend told me about her four year old .She goes to Arabic kindergarten .She is left handed and she is sucking her thumb .The left one . She had developped serious anxiety disorder about falling asleep - and it turned out that one of the teacher had told her - that the left hand belongs to the devil - and when she is sleeping with her left hand's thumb in her mouth she is sleeping by the devil .

I had thought that the teachers are more enlightened here .

Is it only an isolated case or this is the norm here to treat left handed kids ?