This was a huge problem for us, as well. People would make loud sales calls pacing back and forth in front of the empty phone booths.
But I've had this experience working at private offices as well. It's basically a problem anywhere with a) open-office plans and b) sales/marketing people who are in the same area as developers (sometimes startups outgrow a co-working space but aren't big enough for a seperated office).
This is why I work with headphones on the majority of the time whenever I'm in an office (coworking or otherwise). I have enough trouble self-regulating my attention without having to distract myself from others.
There was a similar problem with the capacity of the men's bathroom.
WeWork should take more care that their physical infrastructure is not overwhelmed by subtenants who are mostly alike.