I can answer this one way: I have 3 black cats.
Also I open umbrellas in the house all the time, go out on Friday the 13th, and have never had anything happen.
Superstition is just a way people try to control their world through some kind of system that’s very flawed and senseless.
Some people may be sure it works, but I think they give it power over them, I don’t, and nothing ever happens to me because of “unlucky” things.