LOL... do you live in Europe?

The model 3 is (to within a couple of cm) the same size and class as the Audi A4 and BMW 3-series. And I can assure you that they are very very common cars here.

Likewise, the X is similar to (say) the Audi Q7, the BMW X5, and the Porsche Cayenne, and again, those are pretty common.

The most common size in France (where I'm originally from) is the B-segment: Renault Clio, Citroën C3, etc. So 4.1~4.2 meters in length and 1.7~1.8 meters in width. Model 3 is much longer: 4.7 meter in length and quite a bit larger at 1.9~2 meter in width. Don't get me wrong, BMW 3-series or Audi A4 are not rare in France, but it's not the mass market.

So I don't have the beginning of a clue as to why you are laughing. If you are French then you probably live in an affluent neighborhood. I suspect you live in a different country with different car habits.

Just wanted to confirm what you are saying, that is that the standard-ish car size in Europe is represented by the models you mentioned: the Clio, the Citroen C3, I'll add the VW Polo, Skoda Fabia or Seat Ibiza, cars like Audi A4 or BMW Series 3 are seen as large-ish.