liquor that's really cheap, has a reputation for tasting terrible = young

fruity = not serious = girly!

the gender one is a combination of two things. one some hang ups about how certain kinds of mixed drinks aren't "serious". this is a palette thing, where the more the alcohol flavour isn't overpowered or disguised, somehow the more serious it is. these people feel self important for their palette essentially. the other part is that these drinks tend to be quite pretty. they tend to be colorful and have cute decorations like little umbrellas and we all know men are stripped of their manhood if they come in contact with a decorative umbrella

the gender one is fucking goofy. the idea that women don't know fine liquor is silly, the idea that drinks with flavour added are more serious is silly, the uses that colourful umbrellas are girl is silly. the funniest part is the number of men who spend time drinking alcohol they don't like the flavour of just to be "serious". lmao bro that's sad

the age idea is partially about their palette, but also mostly about the notion that young people tend to drink for the sake of drinking because it's just become available to them. they tend to not have a lot of experience with liquors, they tend to be drinking in high quantities (if they're partying), and they tend to have little money. so they tend to go for the cheapest stuff and either not care about how awful it tastes OR they become accustomed to the taste and like it.

there's some truth to the age one because if you have an option other than everclear or fireball, you'll usually take it

fireball is one of the most contentious ones because everyone either hates the taste and thinks it's the worst thing they've ever encountered on earth or they love it. Ive heard multiple car mechanics swear fireball tastes exactly like coolant

oh and it has an exceptionally strong smell so everyone KNOWS if you're drinking fireball. i one walked into dive bar that had fireball on tap and damn that place had a..... unique smell