The problem is that if rnb don't leave tonight then an actual singer will obv have to leave and that is when opinion will turn against them. Its OK voting for those sorts of acts when they're lots of people still left but when an actual proper singer has to leave for those two jokes, it just becomes a travesty.
There are only so many times the judges can say 'how fun the are' without mentioning the fact they cannot sing a song without making it sound like a karaoke night on new years eve when everyone's pissed!

I won't slag them off as two individual persons, because I think they're great guys and very likeable as people, but I think tonight is the time for them to leave.

Their first performance wasn't great and had no spark, imo. The latter part of their second performance was better after it picked up after a rather slow and insipid start, but I think now the party is over for them.