Do you live in ontario?
I believe the guy is feeding you a bunch of bull.
Why did you let the guy walk into your house, you have the right to say no.
I hope you got his name and any other identifying information, because when you talk to anyone from the city they will ask you where you got this information.
As for keeping snakes tht are no longer than 2 feet, no one would be able to keep any snakes other than worm or blind snakes (and a few others). So I think that this guy was just trying to scare you.
Have you annoyed your neighbours recently?