No. This was in the Philip Carlo book. Around the time of the Windows Scam, Venero Mangano led Amuso & Casso through underground tunnels to Gigante's place and they had a meeting. Gigante offered drinks (you're not supposed to accept), Amuso obliged, got hammered, banged his fists on the table and demanded money the Genovese supposedly owed the Lucchese, Casso was "embarrassed" and felt like slapping Amuso in the face.

Take it with a pinch of salt because of the source.

I also read that Gigante and Amuso were at a wake and Gigante intimidated a "shaking" Amuso who thought he was going to get whacked.

So if one story is true, the other can't be.

Source for #1 Phil Carlo book on Gaspipe
Source for #2 New Yorker magazine article (I posted it before).

Come to think of it, I don't think Gotti & Gravano were at this alleged meeting. I think it was just a Genovese & Lucchese affair.

I invoke my right under the 5th amendment of the United States constitution and decline to answer the question.