It's not as simple as...
Mixed fleet = fun
Euro fleet = pilot-hating-commies
Some of the best at-work nights I've had have been totally impromptu back street bars in the wee hours with EF blue-rinses whose 'Customer Plan' photo suggests they'd prefer to be tucked up at 7pm watching Poldark with their cat.
Conversely I've dined with 4 gorgeous iPhone/Facebook obsessed MF girls who've momentarily detached themselves from tapping away to chat about Britains Got Talent thinking to myself: get me the :~%k out of here!
I flew with an ex-BMI* guy a few weeks back - one of the nicest people I've ever met - we arrived at the hotel after a 30 minute bus ride with the EF crew who we'd been chatting to and laughing with the whole way, skip suggested a beer I was wiped so abstained, all the cc said the same. Next day I saw him and he relayed that he'd gone for a glass of wine only to spot the entire crew walk by. I reiterate that for 30 mins everyone had been pally and full of banter on the bus, then they went and flat out lied. Weird.
It'd drive you mad if you cared enough to try figure it out...
* CC refer to ex-BMI pilots as Barry's and the rest as Nigel's