How do you feel about parents who give people nasty comments because said people bought all the Pokemon cards in a store like for example Walmart?

To get out of the way, I don't buy cards at the local store, I collect Japanese cards so I import. But I have noticed parents have a tendency to get grumpy if someone do buy a stores inventory, even if said person can afford it.

How do you feel about parents who give people nasty comments because said people bought all the Pokemon cards in a store like for example Walmart?
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