As you've said it yourself, it's a matter of personal opinion. And I've already written keh "Jis nay bari bikes chalayee hui hayn woh 250 ko bhee kuch nahin samajhtay". I don't know about holland, but I've spent a considerable amount of time living in Canada. I've NEVER seen anyone riding a 125 there. The least I've seen is a CBR or Ninja 250, aur woh bhee because they were good beginner motorcycles with low insurance.
Here's an example of what you see there. This is from Leslie and Lakeshore meetup ( every thursday ) in Toronto :
This is the yearly Friday the 13ths meetup at Port Dover :
Let me explain something why 125 is garbage to those who are used to bigger motorcycles. 125's top speed is at best 130km/hr, but due to engine vibration and low grip, it's very hard to control at those speeds, heck it's hard to control at 100+. Now for a place like Canada or US, where "normal" Highway speed is 100kph / 60mph , 125 is not even allowed on the the highways/freeways. 250s really struggle at that speed as well. The only exception I've seen in 250 is the new Kawasaki ninja, which still suffers from vibration issues.
Jab ap bari Motorcycle laytay hayn, around 500cc , like a CBR or a GS or a Ninja , (same goes for Vulcan , Shadow or others), to high-speed per ap ko pata chalta hay difference.
Regarding yeh keh wahan normal use main loag cycle use kartay hayn , to pata nahin ap nay Holland main kahan deka yeh, shayed Rotterdam main ho ga, warna my personal use was a Lexus LS V8 aur Motorcycle main VFR ya GS500. One of my friends who worked as an architect used to ride a BMW S1000RR and so did his wife, only because he got two speeding tickets on his Ducati 1299; and the list goes on.
To sum it all down, baat hoti hay jo ap handle kar saktay hayn. Agar ap 125 main khush hayn to let it be; lekin there's a reason why people opt for higher displacement, and it's not always showing off.