We’re designed by nature to make lightning fast decisions (it’s all an outgrowth of our earliest “fight or flee” instincts which were developed for self-preservation and to keep the animals we encountered from eating us) and we make these kinds of snap judgments hundreds of times a day without even thinking twice about them or the process.
You can judge a book by its cover
if you wore crappy old clothes to go out and look for a new car (which might or might not have happened to have been clean), the car salesmen would size you up in a flash and basically either ignore you completely or hand you over to the newest and youngest guy on the floor.