Based on the news video and the fact that they shop at
Walmart every day, and the lady's elaborate coupon binder (exactly like the ones on Extreme Couponing and every coupon blog and website on the internet) I find it very hard to believe that she was not very much aware of Walmart's coupon policy and that as of last April, they do not take competitors coupons. It is very very clearly written, and has been posted on every couponing blog and website from here to Tim Buck Too.
Also, in the video, she was definitely raising her voice and IMO sounded kind of rude. I don't blame the manager from putting his hand up to stop from being videotaped. I mean, who the heck does that??
There's definitely more to the story, but if I had to take a guess at it, I'd say she's a problem customer and they'd just had enough of her.
Walmart changed their coupon policy back in mid April and when a store like Walmart changes it's coupon policy, it's posted on every single website in milli-seconds. And if she had her giant coupon binder set up properly, then she'd have her own printout of the policy on hand.

I wonder if she hadn't been trying to work around the system.
It's extreme couponers like that, that behave so obnoxiously as to try to videotape the manager stating the coupon policy, that make those avid couponers that are trying to do it correctly and honestly look bad.
I know some say well the guy shouldn't ever touch someone else's personal property. True. But put a video camera in my face without my permission, and see what happens to your personal property.