To be fair Mandalay, there's a lot of UK-based posters on MN who love to put the UK down too. See: interminable threads about "British exceptionalism", "laughing stock of Europe/the world", "other countries looking on in horror", "worst infection/death rate in Europe" (even when that wasn't actually true at the time of posting), "lockdown lite", how we're too pathetic/selfish/thick to stick to lockdown rules, unlike the sainted Europeans who barricaded themselves into their houses 24/7 and never once raised a peep of complaint about it etc etc. For whatever reason I think MN attracts a disproportionate number of very insular posters who've never really interacted with anyone from outside the UK, and I guess that can warp your perception in one of two ways.
Malteser you don't see why generalizing the character of a whole nationality negatively, especially as an outsider, might rub people the wrong way? Imagine someone saying "I think there's something subservient in the Indian psyche, probably because of their history as one of our colonies" - wouldn't that sound racist to you? There's a big difference between "I noticed several people I met in country X thought Y, I wonder if it has something to do with their history of Z", and "I think people in country X are very Y because of Z", which was more how your post came across.