Shouldn't there be a decency limit in expressing Nationalism...????

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maybe i asked myself and my frnds about this several times. but got mixed responses.Every time when a wrestler and many a sports person do their athletics wearing their national flag as ''Undergarments'', even though not my fellow countrymen....really annoyes me. May be i think that shouldn't be the way u do a great work in your field and feel proud by wearing your national flag as your may be Undy's or accesories or even shoes and what not ??? i personally don't think that is the right way to show that u belong to that country.!!!! there has to have a decency limit in your expression of Nationalism...isn't it ??? i think it is totally OUTRAGEOUS... what u all think....let me know.