I think it was done on purpose. They were clearly having a conversation abput Alex. BB could have asked 'and how did this make you feel?' but they ask 'how did it make you feel that ALEX didnt take part? Why say her name?
It was also quite cruel. Especially since Alex acts like she would decapitate any housmate who is isnt 'ready'. It was unfair and to poor Mo on his bday aswell!!