I am not a troll.
People who do not get offended do not usually explain "why they did not get offended". Truth is that you did get offended. In fact any person having even little bit of self-respect will get offended.
Back on topic
Sri Lankan expats have a tendency of trying to disassociate themselves from Sri Lanka's history, demography and geography. Truth is that all nations in the South Asian regions have deep connection with each other. This region is unique. Sri Lanka is a part of South Asia.