"Booth babes" used to be a staple at every conference. Over the last 10 years, they've become sharply disfavored, because staffing your trade show booth with scantily-clad women with no connection to your company is a fucking creepy thing to do.
People still do it, but by this time 5 years from now, everyone who does will be a pariah, trading on shock value. Those people/companies will always exist. Their existence isn't evidence that what they're doing is OK.
Oh, I wholeheartedly agree that they have "creepy" elements.
That said, this sub-thread is more nuanced. This article wasn't written because of "booth babes" offending someone at a conference that Microsoft helped sponsor.