For instance, people do genrally even exihibit ‘drunken’ behaviour, even though they have had no alcohol.
But genrally people are very addamant they can distinguish by taste their ‘own’ brand from others. If you do a blind taste test of lagers you’ll find out that most people are not able to pick their preferred brand. This is also not only amateurs, even sommeliers get fooled easily: realclearscience.com/…/the_most_infamous_study_on…
Taste is just very difficult and personal. Thats why people are overly confident on their own taste, but generally people tend to mimic each others tastes, as the Sideways movie tanked interest in Merlot and increased interest in Pinot Noir winebusinessanalytics.com/…/The-Sideways-Effect .
Like I said some people are very good at tasting, but generally people overestimate their abilities, a true blind taste test is very fun and informative. You should do it with friends!