It likely jams their brains. Accepting a sudden change of plans is a skill. They rarely have to practice it. When it happens they either want to understand it (and so ask a lot of questions). Or they want to make it go away, and so try and bully you into accepting.
You sometimes see a similar thing in dating. Women almost never have to deal with direct rejection. Most are smart enough to take it gracefully, but a few get wildly inappropriate and aggressive about it. Men are on the other side of it. More used to being rejected, and so better at rolling with the punches. You still get a few that react badly however.