Right, here goes.
There was once a man named William A. Higinbotham. He was a nuclear physicist, who worked on the Manhattan Project, and later became an outspoken supporter of nuclear non-proliferation. In the 1950s, while working at the Brookhaven National Laboratory, he recognised that visitors to the laboratory sometimes found the experience somewhat tedious. As an avid and self-confessed pinball player, he decided to work on a little electronic amusement for the visitors. In 1958, he designed the first multiplayer video game, Tennis for Two.
Now, if your father thinks he's better than this nuclear scientist, who held the power of the atom in his hand, and who wished for it to be used to construct a better world, rather than blowing it into bits, and who still decided to make a little electronic curiosity for people's amusements, come back to me, and I'll work on something to knock him out of his delusion.
I've got plenty more ammunition (pun not intended). I'm not going to let ignorance get in the way when I have the upper hand.