As a sommelier and brewer with years of experience, I can confidently say that frosted mugs are best suited for certain types of beer. However, it's important to note that this is a matter of personal preference and there is no right or wrong answer.
When it comes to frosted mugs, the general consensus among beer enthusiasts is that they are best suited for macro pilsners and lagers. These types of beers, such as Budweiser, Labatt Blue, Coors, and Miller High Life, are typically light and crisp in flavor. They are often enjoyed ice cold, and the frosted mug helps to maintain that refreshing temperature.
The coldness of the frosted mug can enhance the crispness and effervescence of these beers, making them even more enjoyable on a hot day or after a long day's work. The condensation that forms on the outside of the glass can also add to the overall sensory experience, making the beer appear even more refreshing.
That being said, it's worth noting that craft beers, which tend to be richer in aromas and flavors, are often best enjoyed at slightly warmer temperatures. Frosted mugs can mask some of the subtle nuances and complexities found in these beers. Craft beers are often served in a variety of glassware specifically designed to enhance their flavors, such as tulip glasses, snifters, or pint glasses.
Personally, I have found that certain craft beers, particularly those with bold flavors like stouts or IPAs, can be somewhat muted when served in a frosted mug. These beers often have delicate aromas and intricate flavor profiles that can be better appreciated when served at a slightly warmer temperature in a proper glass.
While frosted mugs can be a great choice for macro pilsners and lagers, it is important to consider the type of beer you are drinking before deciding to use a frosted mug. Craft beers, with their complex flavors and aromas, are often better enjoyed in glassware specifically designed to enhance their characteristics. Ultimately, the choice of glassware comes down to personal preference and the specific beer you are drinking.