I have stipulated same that its not bad to advise friends but its just the equation between two people that prompts salman to ask other person of one's actions.
If they celeberate their bonding/connections on the show and if it adds to the value of their game then salman is liable to question one person for others actions.
Point was Salman only scolds Ruby.
Aly and Rahul are friends and they mess up too, why dont they get blame for each others actions?
Ruby got blamed for Jasmine, Nishant, Nikki and even Rakhi!