Salman reprimanded Deepak for using such rash word unknowingly and not even apologizing later on. It was necessary for Salman to reprimand Dipak of his actions as it has gone extremely wild. If this continues he would surely leave from this house after he has been beaten black and blue.
He will have to be thrown out of the house which BB doesn't want and so a warning on his usage of words have been put across.
Coz if not Salman wouldn't have reprimanded Megha so openly.
His exact words to Megha were. : She was very well aware that Deepak used that word in context of behaviour and did not mean the actual meaning but Megha dug gold when she heard that word.
She immediately picked that word to gain lime light. She went correct for sometimes but then got carried away when she spit and threw slippers on Deepak which hit him.
If he was genuinely supporting Megha, he would have never clarified Deepak's stance nor put allegations on Megha for trying to use a situation to her advantage to get footage.
He scolded Megha way more than Deepak.
And as far as taking his sisters name is there he used it to explain Deepak the real meaning of the word and i did not find it wrong.