Hearing people refer to Asia as a single country and disregarding the fact that while one can certainly be from the continent of Asia, their nationality is separate from that and is usually tied to their country of origin.
For one reason or the other, many don't really know the difference between continent and country either. This misconception manifests in thinking of Asia as a single country with the same cultural trends, traditions, politics, history everywhere.
Asia, however, is a continent with many countries. In fact, it is the largest continent on Earth. With its 48 countries and several dependent and unrecognized territories, it is also the most populous one. Being the vast portion of land that it is, Asia has seen massively different things happen to its different regions in terms of history, culture, religion, language, demographics, nature, etc.
People who identify as coming from an Asian country often hear ignorant remarks, especially in the West, about "Asian cuisine," or "Asian culture", false and often offensive generalizations about Asian countries and ethnicities. In this video, a Tumblr user explains an example of the frustrations they frequently face.
To recap: Asia is a huge continent with many different countries. Here they are, in alphabetical order.
1. Afghanistan
2. Abkhazia
The Republic of Abkhazia is claimed as an autonomous region of Georgia and recognized by 4 UN states.
3. Armenia
4. Azerbaijan
5. Bahrain
6. Bangladesh
7. Bhutan
8. Brunei
9. Cambodia
10. China
China is the most populous country on Earth!
11. Cyprus
Cyprus is an island in the Mediterranean which has a Greek and a Turkish part.
12. Georgia
13. India
India is the second most populous country in Earth!
14. Indonesia
15. Iran
16. Iraq
17. Israel
18. Japan
19. Jordan
20. Kazakhstan
21. North Korea
22. South Korea
23. Kuwait
24. Kyrgyzstan
25. Laos
26. Lebanon
27. Malaysia
28. Maldives
29. Mongolia
30. Myanmar
31. Nagorno-Karabakh
Nagorno-Karabakh is claimed as part of Azerbaijan and recognized by 3 non-UN states.
32. Nepal
33. Oman
34. South Ossetia
South Ossetia is claimed as part of Georgia and recognized by 4 UN states.
35. Pakistan
36. Palestine
Palestine is a state with limited recognition.
37. Philippines
38. Qatar
39. Russia
Russia is the largest country on Earth!
40. Saudi Arabia
41. Singapore
42. Sri Lanka
43. Syria
44. Taiwan
Taiwan is claimed as part of China and recognized as an autonomous region by 21 UN states.