[tragomaskhalos]

In the UK there is indeed a reluctance to correct people's English as you say, but if you live somewhere like London you are surrounded by non-native speakers so apart from other considerations it would also be exhausting to correct everyone's errors. We must also be mindful of the reality that English is the global language, and as such it is arguably not the place for someone who speaks a particular dialect to be overly prescriptive. The situation in a Slavic county is likely to be different - a non-native speaker is I suspect far more of a novelty, and the reasonable assumption for native interlocutors is that the non-native is actively eager to improve their proficiency rather than merely trying to get by in the language, so feedback is welcome.