I guess that, with vibe coding, it is very easy for every client to become like this.
Also the worst kind of tech line-manager - typically promoted from individual contributors , but still want to argue about architecture, having arrived at their strong opinion within the 7 minutes they perused the design document between meetings.
If you're such a manager, you need to stop, if you're working with one, change teams or change jobs - you cannot win.
It's far from trivial when there are multiple, clearly-communicated trade-offs (documented in the design doc!) that, but you happen to land on opposite ends of value-judgements (e.g. pattern A is easier to maintain based on my experience with the codebase & bugs that have popped up, but manager thinks pattern B is simpler to implement, but brittle). The debate wastes time, and signals mistrust when you're the staff engineer, or the design was OK'd by staff/rest of team
That isn't unique to "clients." It's human nature. Human's don't know what they don't know.
See: various exploits since computers were a thing.