A lot of this list just reads that they have coworkers who are jerks. Not interacting with cleaning staff? That seems like a personal problem. And I’ve seen plenty of frugal VPs that drive 15 year old cars and make their own lunch. That said, I was also pretty horrified once when I was waiting in the lunch line and heard the person in front of me complaining that their six month $100k bonus wasn’t as high as they tho…
You shouldn't be horrified at that complaint. If a company hints that it's going to be 150k when they hire you and it ends up being 100k that is a valid complaint. You are just perpetuating the don't talk about pay rule which benefits the company over the workers.
I think the person you replied to was not necessarily horrified at the complaint to a fellow engineer. They were horrified that the complaint was made within earshot of a cafeteria server, who might envy the engineer for even having the chance to make that much money. I think the principle behind that horror is “it’s rude to avoidably inspire envy in others”.