I don’t see it matters on this forum. If you do a search for Turkey or Istanbul, both threads will come up. If a mod feels strongly enough about they’ll move one or the other.
UKP doesn’t have a formal classification as far as I know. (Unlike. ISG for instance — which puts it in Europe by the way). I wonder if anyone wanting to get arsey about it has actually been there?? Geographically and historically it’s always been recognised as having an Asian side and a European side, joined by the bridge. Thd European side tends to be more ‘modern’ and ‘European’ -looking and punters often refer to the ‘European’ side or ‘Asian’ side when giving directions (though I may have forgotten to do so when leaving my review a while back).