That he/she likes gin and tonic. Maybe that he learned to drink in environment when those kind of drinks were preferred, but you cannot be very sure about that. There are more exceptions than occasions this apply :D.
I think it is too little to know anything about person with sufficient probability. Much more you can tell by way he/she drinks that drink. ...
That's all it says. It doesn't turn me on and it doesn't turn me off. I've liked girls who drank Prairie Fires (yes, she'd drink them like rum & coke's all night long - she was crazy!), Sweet Tarts, and everything in between. It's not about what's being drunk, it's who's drinking it that I'm interested in. The only time her choice of drink is of any importance is when I'm going to buy her another.
I don't always drink liquor, but when I do I prefer gin.
I'm not sure that it really says all that much about a person. Gin drinks (martinis, gin and tonics, Tom Collins's, etc.) tend to be seen as sophisticated and/or pretentious, but I'm not sure how much people really care to be honest. Drink what you like.
I hate gin, it's so foul. Reminds me of underage drinking days. Yucky. I don't know, you can tell how rich or cultured they are. I know most young people enjoy alco pops, the sweet ones. I enjoy bourbon and coke hah classy
Both gin and mojitos have very strong, natural flavors (that is the best I can do to describe it). Gin is made from juniper, which is a type of evergreen tree and one component of mojitos, which happens to the the componet that most people who hate mojitos do not like is mint.