My dad was fine with the idea, and then he ended up changing his mind and his reasoning. I am trying to figure out why he said no and tell him the reason why they aren't useless and are a good investment that I want.

He was okay at first. Then..

First he said he doesn't like snakes, then said that wasn't why.

Second he said that we have no space, then I made space.

Finally, he then used the excuse "they're useless" and was a no.