It's not my fault that I'm small enough to be carried off by monsters, and it's certainly wasn't my idea to get possessed by an overgrown immortality complex. I'm a competent adult, and I'll thank you to remember that.
It's one thing to have a shape-changing alien with more personality than can fit into a room whether it's bigger on the inside than the outside or not treat me like a child. The Doctor's been traveling around the universe longer than I've been alive. But when Harry Sullivan starts trying to pat me on the head I draw the line.