Most people use abusive words directly (Rajev's words like chakka). But some like Imam say the same thing in a different way. Example, he said he knows how Vishal won Roadies (and this said multiple times) and then talked about his relationship with the Roadies host.. I don't remember the exact words but the implication was clear that Vishal slept with the other guy. Which is worse is for people to decide.
As for Delnaaz, she also admitted that Imam never said anything to her and so from her POV she did not need to talk about his nature in her chat..