Maybe the entities in your mind don't "like" alcohol, but in mind they don't seem to have a problem with it. Maybe, subconsciously, you already approach alcohol use in a negative manner.
Vaporizing DMT while heavily intoxicated on alcohol isn't very pleasant for me, the whole experience seems dull and mundane at even sub breakthrough doses, If I do breakthrough the experiences can still be great but I find recollection of the experience is even more difficult if one has been drinking heavily prior to smoking.
I find there's no conflicting vibes within myself if I have a few beers and smoke a little spice, the experience is always more than rewarding. I can still achieve Brahman, liberation and Nirvana even after having a few alcoholic drinks, and entities never seem bothered by the fact that I drank alcohol.
Maybe your subconscious is trying to tell you something about your alcohol use, rather than DMT or entities.
“The most compelling insight of that day was that this awesome recall had been brought about by a fraction of a gram of a white solid, but that in no way whatsoever could it be argued that these memories had been contained within the white solid. Everything I had recognized came from the depths of my memory and my psyche. I understood that our entire universe is contained in the mind and the spirit. We may choose not to find access to it, we may even deny its existence, but it is indeed there inside us, and there are chemicals that can catalyze its availability.”