Please, whoever has anything to say, do not denigrate other's Gedolim. Whatever you think of Putin, he is my president and prime minister for life! When talking to me, it is very disrespectful to refer to him in a derogatory way. Got it?
The only way I got someone to talk respectfully (when having this huge argument in Tzfas, in the Yeshiva) was showing this guy how it feels if you talk about their Gadol the way they talk about your Gadol. "Do you know what they say about ... and the stories they say about him when he was in ...??"
This means - do not say shach or shneorson or ganav or sinas chinum etc. you may not change the way you think about someone but at least temper the way you talk about them.