I guess it's creepy in a similar way as people shooting other people virtually (in shooter video games), though a making a waifu "vending machine" adds another angle of objectification to it.
As globalization moves on there are more and more people without romantic partners and/or close friends nearby and they'll use their imagination to fulfill desires they're missing.
Because yea, it's creepy.
Are you sure that you aren't just using "creepy" to shut down non-traditional forms of private sexuality?
Also, just cause you find it creepy doesn't mean it's reciprocated by everyone else in the world. Besides, the usage in that booth was very tongue in cheek.
Sarcasm aside, this is one of the many, many examples of choosing a scapegoat to frame an entire sexuality, race, or any group of people with a common interest as evil while completely ignoring any and all context. People are not animals and possess some degree of responsibility and the ability to tell reality from fiction. Unless someone presents some hard evidence that stylized drawings lead to actual attacks against real children (and to my knowledge, this simply is not true; in fact, it's easy to argue the opposite) we need to stop with this puritan outrage like we stopped blaming computer games for any and all violent crime back in the late 90s.