It means they're plain old normals, but he won't listen to everyone who tells him that.
And you're right I jumped the gun here. Mostly because OP was previously housing the snakes he started with inappropriately before. I'm sorry ECechoHO, I know you came here to learn and I hope you keep doing so. As long as they're being supervised and all snake are now being housed separately when not together for breeding purposes, there shouldn't be a problem.