I've never had that bad of a reaction to tequila, myself, though I know quite a few people who won't touch it. Same with gin -- I have more than one friend who swears it's pure evil, but it doesn't really have that effect on me (even though I do get drunker quicker on gin than on vodka).

Of course, this may just be because I'm too much of a pansy drinker to have *enough* booze to have such a notable effect. >shrug<