I have no idea of my tolerance because I can't stand the taste of alcohol and thus don't drink. It would be a great scam if it ween't true, because almost every time I tell people this, someone insists that they know of something that there's no way I'd be able to taste the alcohol, and/or that it's so great I won't mind, and a fair few offer to get me some to try. Thanks to the fact that my area's Regional Gathering has an event called Pretentious Drinking, I have had the chance to try a sip of quite a variety of alcoholic beverages, and every single one tastes like cough medicine to me. They're disgusting and I just can't manage more than a little sip, before making the exact same face cats make when they smell alcohol.
I tried starting with watered wine, but that either has so little flavor to it that there's no point, or it passes the threshold for cat-face. The only thing I ever tried that was anywhere close to acceptable was a mead at a RenFaire, but I've tried other meads since then with no luck.
At this point, I'm happy to just be a non-drinker -- I've seen how much other people spend on booze, and I've seen the stupid things people do when drunk. I grew up in a university town, and after every weekend there were blurbs in the paper about kids falling off balconies, getting hospitalized for alcohol poisoning, passing out at frat parties with tragic results, stepping out in front of cars, or whatever else. I can have fun without alcohol, so why bother?