I wonder if it is regional or has other socioeconomic factors? Actual satellite dishes weren't common structures when I was growing up, outside either a sports bar with satellite TV feeds or more commonly large dishes on industrial, military, or scientific facilities. Other, smaller directional antenna were more commonly seen on radio towers etc.
In my general area, just a few hundred kilometers separates two groups of people who are frequently confused by each others' usage of the word "party store." Expanding a hyponym's meaning to encompass that of its hypernym is so common that I'm not even sure it requires special explanation. I've got some family members whose favorite kind of coke is Pepsi.
