This isn’t the gotcha you think it is, because the Bible literally says as much in Isaiah 45:7:
I form the light and create darkness,
I make peace and create calamity;
I, the LORD, do all these things.
However, it’s not valid to conclude from the fact that God created evil that He must therefore be evil, because He created good as well. At best you could say He is neutral.
In fact, it is you who is evil because you ignore all the good that He does and focus only on the evil.