Maybe he knows their political affiliation? 
But seriously, has he been neutered? My mini will be a year old on Monday and I haven't noticed any change in his attitude toward strangers. In fact, just yesterday, he climbed on a homeless man sitting on the pavement and licked his face. People are always approaching him and petting him and he always acts like they're his long lost BFF. So I think something else is going on with your little one.
Then again, Teddy might be atypical.
But seriously, has he been neutered? My mini will be a year old on Monday and I haven't noticed any change in his attitude toward strangers. In fact, just yesterday, he climbed on a homeless man sitting on the pavement and licked his face. People are always approaching him and petting him and he always acts like they're his long lost BFF. So I think something else is going on with your little one.
Then again, Teddy might be atypical.