Except the UN statistics division considers Poland to be part of Eastern Europe.
en.wikipedia.org/wiki/Eastern_Europe says:
* The United Nations Group of Experts on Geographical Names (UNGEGN) was set up to consider the technical problems of domestic standardization of geographical names. The Group is composed of experts from various linguistic/geographical divisions that have been established at the UN Conferences on the Standardization of Geographical Names.
1. Eastern Europe, Northern and Central Asia Division: Armenia, Azerbaijan, Belarus, Bulgaria, Georgia, Russian Federation, Ukraine, Kyrgyzstan, Mongolia and Uzbekistan.
2. East Central and South-East Europe Division: Albania, Bosnia and Herzegovina, Bulgaria, Croatia, Cyprus, Czech Republic, Greece, Hungary, Poland, Serbia, Slovakia, Slovenia, Republic of Macedonia, Turkey, Ukraine.
3. Romano-Hellenic Division: Fourteen countries (...)
East Central as I said before is acceptable (Polish: Europa środkowo-wschodnia)
Because they're used to it.
I'm also used to term central Europe.
Poles get upset because they see it in a negative context. Or?
No, they just feel that are constantly confused with Russians. I dont see any negative contect but i just want to emphasize that we dont feel connected with eastern culture.