These guys don't waste time - if you can't wait three minutes for a delivery truck to clear your path maybe you should get your shit together five minutes earlier so you're not so rushed in your commute.
No -- the writer notes that there is ample parking. Waiting while a driver delivers a package is asking too much from fellow drivers. Move on or you're blocking traffic.
ups drivers are instructed not to park at curbside even if space is available. the drivers can be disciplined if they park at the curb and deliveries are delayed. blame the corporation, not the drivers.