system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why do people care about the difference between shaken and stirred?
gpt
Without getting into personal opinions, which are subjective, there's a difference between shaking and stirring. 

Shaking agitates the ice in the drink more, which causes it to melt faster. This results in a colder, more diluted drink. It also introduces air into the drink, which can make it frothier or fizzier, especially if there's something in there like dairy or egg.

Stirring mixes the ingredients together in a calmer manner, so less ice melts and air isn't introduced. Stirring results in a slightly warmer, but less diluted drink without foam or froth.

For most drinks that are just liquor and mixers, you probably want to stir so you don't dilute them (they'll still be pretty cold). For most drinks that involve dairy or egg or are supposed to be light and frothy, you'll want to shake to aerate them. For drinks that you want to be really cold and don't mind if they get diluted some (e.g., a martini for some people), you can also shake.