This is a lie sponsored by alcohol companies. There is no safe amount of alcohol. It’s not the amount but the molecules that put you at risk.
My sincere apologies for being MIA when I could have weighed in here earlier! Before I say what I want to say, I want to make it clear that I am in no way glorifying the consumption of alcohol beyond it's intended responsible use for those it works for. We are human beings, we are all different, and all substances effect us in different ways. I have known people close to me that struggled horribly with alcoholism who only drank half of the amount I would drink and I've never once had a problem. We are all just built different.
DM3, the way in which you speak about alcohol leads me to suspect that it has negatively effected you in a personal way, whether it be you or someone close to you. I get it, I do, and I'm sorry if that's the case, but here on the Nexus all substances are open for discussion and OP had a very good question, it's not your job to shut it down and silence discussion, and your replies are all mostly rooted in opinion.
I skimmed through the thread, so my bad if Pandora or someone else linked it, but I actually did a quasi analysis from the effects of DMT + Alcohol and I experimented with it quite a bit. You can find that thread here.
A pictorial analysis on color densities under the effects of DMT+Alcohol
OK anyways...
Is it safe? Well, combining alcohol with other substances is generally frowned upon, as it opens up more risk when it comes to synergies. For instance, Ketamine and Alcohol is well know synergy that can be fatal at high doses, and is widely discouraged even at small doses. This too is something I've experimented with as I have a very high tolerance for alcohol. Obviously some wine and cannabis isn't really an issue, and there are plenty of other examples as well.

Some of these synergies shown here will be contested by others, but it's a decent general guide for quick checking your substance combinations. DMT + Alcohol is considered low risk, but even if it IS safe the question should be... should you?
As for DMT, I get a little nervous before a blast off which is completely normal. I've smoked DMT completely sober many times, but my preferred method is to have a nice cocktail like a Mai Tai, Azalea, Last Word, Aviation etc that has around 2oz of 40% alcohol before blasting off that's enough for a buzz and also tastes delicious. When smoking DMT on a small buzz like this, I barely notice the synergy at all and I feel fine, the alcohol has never impeded my trip this way.
Now, I have smoked DMT a few times after being nice and drunk, probably after 8 or more drinks or so, idk I never count and but the synergy is impossible not to notice and very much works against you. For one, alcohol is a neuro-suppressant, so being shitfaced and drowzy while laying down during a strong breakthru can be dangerous, you could puke or fall asleep or fall over, the possibilities are endless when you're a psychonaut and a drunkard. Also, it's just not a good trip. The colors are desaturated, the visuals are dulled, and every time I've tried it I've been denied entry by entities that are none too happy with my disrespect in showing up that way. It's been a long time since I've done DMT whilst really drunk like that, as I just don't see the point. It's a waste of DMT.
But a cpl beers? A strong cocktail to take the edge off? I pretty much prefer that 9/10 times now. As
@Pandora said, this is something that works for me, and that does not mean that it will work for everyone, nor am I encouraging it in any way. I just wanted to alleviate some concerns here considering I'm a walking poster child for the synergy. Always check how these substances interact with any medications you are taking as well. For my synergy is was strictly a cocktail and a breakthrough dose of spice, nothing more, nothing less. In my experience, it's completely safe for me.
This whole alcohol is poison thing has grown out of control. I'm very happy that people are paying more attention and finding a renewed focus on health and wellness but these Huberman podcaster types that vilify the social lubricant our species has been prosperously enjoying for tens of thousands of years drive me crazy. I've heard one of these guys say a glass of wine with dinner is now terrible for you. Get outta here!
Again, not glorifying it, but I really enjoy a good drink, and if I want to use one to help coax myself into a comfortable DMT trip then I'm gonna have myself a nice gin gilmet or a glass of Japanese whiskey on the rocks. I hope this helps. Be safe and drink responsibly lol!