I've seen an episode where Bourdain was a bit drunk. He became an arrogant opinionated flaming queen that would get in your face because he knows better than you. Summing it up you can tell he's a mean gay drunk (when drunk).
But hey, I'm not perfect. I like his show.
I read Bordaine’s book . He does admit to past drug addiction , being a drunk and a thief , but no mention of him being gay . Brags about female conqests and his wife .