I drive around a big ass bus for work, and sometimes private. I van fit in every parking spot a normal car can fit in. Hell, sometimes even better, because the front wheels are all the way in the front. I can fit about 8 times as much inside my bus that people can pun on their yank tanks.
I have a 2008 Dodge Sprinter. I take two parking spaces (pull through, not straddling,) every time I go to the hardware store or a protest. Only real use I have for the thing is hauling shit. Mine is 24' 1". I actually scout for a good parking lot nearby if I'm going to use the thing, as it absolutely will not fit into a single space. I also have an E-bike and a Chevy Bolt for running errands, or picking up people/groceries respectively.
There are definitely exceptions like your van, but overall vans just aren't that long. Most people who want something that big just end up getting a bread truck. Now those you have trouble parking, so I can see why you got the van.
The average tansport van is about 18ft long. And the standard U.S. parking space is also 18ft long, this means the average van will still slightly stick out no matter what, but by no means as much as a 22ft beast on wheels.
There are also older model vans, which are more common, only reaching 16ft in length, so those will be able to properly park in standard parking spots.
I did give them the benefit of the doubt... by not actually putting that sign on their car!
If they're one of the very rare "I actually need this vehicle", fine, but we don't know.
If they're one of the common "I NeEd tHIs gIAnT veHicLE" people compensating for their own insecurities... not done, but also more likely.
No one here genuinely hates tradies (etc) who genuinely use large vehicles... we hate people who buy them without needing them, because too many of them suck for everyone.