By Farhana Dawood BBC News 2 April 2015 From the section Australia The right to be casual and the veneration of a laid-back approach to life are prized in few cultures as much as they are in Australia. So when Qantas decided to enforce its “smart casual” dress code in business and club lounges in Australia’s main airports on Wednesday, Australians weren’t going to go down without a fight. Singlets are not welcome in the lounges “Singlets, bare feet, rubber thongs and clothing with offensive images or slogans are, in most cases, likely to be deemed unacceptable,” said Qantas. Rubber thongs are definitely not welcome. The status of leather thongs is unclear in Qantas’ new regime And Twitter…