most of the people I tell, their reaction is a combination of surprise and curiosity. like, they are aware of pinball as a thing people used to play before video games, but never realized people still play it or could have them in their home.
the rudest reaction I had was from my brother. after telling him I bought a pinball machine, his immediate response was "why? pinball is lame."
he has since told me when he told his friends, though, they all immediately got excited and said they wanted to come over sometime and play.