I am able to tolerate drinking to varying degrees. I have a couple of interesting reactions to alcohol though.
First, my "buzz" so to speak, is all over the place. Some times I'm pretty drunk after the first glass, and other times a whole bottle of wine will not seem to have much effect at all. I make that a rare occurrence but it is not an uncommon one when I do drink. It's as if I am not metabolizing it at all.
Second, when I am having an MCS episode where something is causing a reaction, booze can mitigate it. I had a bio-chemist give me his theory on this phenomenon once and it seems plausible at the time but I could not cogently repeat it. I am not entirely clear if this is a placebo effect or really a mitigation. It sure seems like the later though. This came in very handy when I had to fly last year. Few things are as stressful as playing Axe/Channel roulette in a sealed metal tube for 2 hours. <beertender? hit me again sir!>
Finally I find that I've been in a state over the last few years where boozing will leave me depressed for days. Not unheard of of course being a depressant, but it did not effect me this way previous. Now, I know that if I drink, I need to be prepared to fight nasty gremlins for a few days and trust that they will pass shortly. since I'm fairly frazzled on a daily basis any way, this has reduced my libation down to almost nil.
I will also say that to some extent a few years ago drinking moderately actually seemed to help things, but any regular drinking has lead to pretty clear crashes and backsliding.
booze has been about socializing and taking a load off for me in the past, but it has kinda moved into the self-medicating category too over the years, which is less healthy. I feel so damn bad and so under siege that I desperately need a break now and again.
Like everything else I guess drinking is now a tangled mess.