It's that the Doctor has spoken more in this brief conversation than he has in the entire time since his return. So it feels like he is dominating the conversation, and he has said far more than he is comfortable with...

"You interpreted my question as such. As you said, people will decide what they see."

It doesn't mean that they are making sound decisions. And the Doctor chuckles softly at the last bit.

"I'm president of Earth in my universe...."

Not that he likes it. But he doesn't need to join any more kingdom than jhaving the entire planet, thanks. Besides, he hates being under anyone else's control. And boy did people want to control him as president.

"In the meantime, though. We're both here and agree we're allies."

So nothing else matters.