I've been yelled at for taking out things besides a laptop, including a tablet with a keyboard case. I'm not even clear what the issue was; it was just a gener

I've been yelled at for taking out things besides a laptop, including a tablet with a keyboard case. I'm not even clear what the issue was; it was just a general "don't take your tablet out!!" as if it was an obvious rule that anyone with common-sense would understand, and clearly I was a fool the agent had no time for.