It seems they want to enjoy travelling to other cities while blocking other travellers from coming to their city. Same with Waze traffic being routed on previously less known streets.

No, they just want travelers to sleep in places designated for travelers. This wouldn't even be an issue if it wasn't a real problem - a well-behaved group of transients is near-unnoticeable in a neighbourhood and by definition doesn't disturb anybody.

Another problem is that the proliferation of this practice seems to be disturbing the already tense situation on the housing market. Meeting an odd couple from the other side of the world is fun. Realizing that you can't find affordable flat to buy in a city because a significant portion of it is scooped up for renting and short-term leases - that drives up societal discontent.

Why is this crowd suddenly all for restrictive zoning when it comes to AirBnB, yet zoning is evil NIMBYism otherwise?

Being for AirBnB not driving illegal behaviour != being in favour of zoning. Those two concerns are orthogonal. Empathizing with other people's legitimate issues doesn't imply being pro-zoning either.

It seemed like you were in favor of corralling travelers into designated zones and took an issue with residential areas being used for short term leases.