Be aware that some call-in shows will screen callers beforehand. Callers who sound angry or who explain that they want to confront Evans about his misbehavior may not get through. But I would assume that there will be an open chat window which will only restrict high-volume spam comments. And, of course, there are the comments on the video itself.
If you do get through, avoid screaming or sounding aggressive. The interviewer may use that as a pretext to cut the call short and avoid a messy exchange. Be calm but assertive, and ask the questions as matter-of-factly as you can. Keep the questions short and direct. That way, if the caller is cut-off or dismissed, the question has been asked and it must be addressed or ignored. Either way, people learn about it.
Best case scenario: he avoids or ignores one or two uncomfortable questions, then abruptly ends the interview when he realizes that it's heading for disaster. And we end up with another comical mess that he and his most loyal followers must deal with.