PAX are required by law (law? or regulation? anyway...) to place all 'liquid' toiletry items (even if they gels or solid) in a closed bag of a certain size.

I do that. I also carry extra ziploc-type bags in case the bag in use breaks or rips.

Preparing to return from Paris recently through Calgary (don't ask) I used one of these ziploc spare bags to hold cosmetics and makeup I had purchased.

Departing Calgary, I was put through a 'bag search' in a private cubicle (my request). The agent amateurishly pulled everything out of the bag in a jumble including the regulation small bottle/liquid in bag--and when she came to my second ziploc bag holding only lipsticks and powders etc, she said 'You're not supposed to use those bags except for liquid." I never make any response to these agents. She found nothing of interest in my bag, so I began to repack it.

Is this so? Yes, I know, it's required to put all liquids in a ziploc bag.
But--is there also a second unspoken regulation--'don't use ziploc bags for anything else' or 'don't use ziplocs for other purposes'? Surely this cannot be correct.
Observations please.