Is there such a thing as too much patriotism?

The only time there is too much patriotism is when they say, "My country, right or wrong". As for their opinion, everyone has one of those. It s neither good nor bad. To me, the height of impertinence is to fly or carry another country's flag in protest. In countries that do allow that, the individuals involved, have the right to leave. So, it makes no sense to for a person to be that impolite and impolitic as to flaunt another country's flag.