Sydney nightclubs and bars refusing entry to patrons

In what seems to be turning into a trend lately, people who have been refused entry into particular nightclubs and bars in Sydney, are suing these establishments, mainly on grounds of discrimination.

Recently, Scruffy Murphys management was accused of telling security guards to reject anyone of Islander or Middle Eastern appearance because they see these people as "troublemakers". Yet I have been there several times and everytime its drunk and rude English guys starting fights with each other.

And now there is this:
Man sues after bar refuses entry
http://www.news.com.au/story/0,23599,21698884-421,00.html

The well known 'Establishment Bar' in Sydney is under fire for this refusal. According to this news story:

"Ms Eastman said the bar did not dispute that Mr Yusofzai and a male friend were told by a security guard at the door: "There are too many guys inside, you can't go in."
But she said the bar manager informed Mr Yusofzai it was a "safety issue" relating to "the number of persons who may enter the premises"."

This is funny again considering what was mentioned earlier in the article:

"He eventually gained access when a female friend exited the bar and escorted him inside on her arm." Yet I thought they didnt allow the person in due to a "safety issue", but when a female helped him get inside, no-one said nothing!

Is Sydney really becoming this stuck up? I have faced refusals into nightclubs many times, is it my ethnic (European) background that pulls me back or is it really my shoes or no collared shirt as quoted by security/door persons, yet I see inside the club many people in what they consider not correct attire. It doesnt take a rocket scientist to know the answer to this...