Oh dear - there is a dress code; but nothing that says you cannot get pissed as a newt and behave like a drunken slag. Sorry, naughty me to use such language.
We went to Ladies Day a few years ago for DSD's 30th birthday. We did witness a fight there, but it was more on the lines of "take that, you bounder", with both protagonists fully dressed. It was more amusing than anything and certainly nothing like this video.
We've seem of young women at Newmarket struggling to walk at the end of a days racing, and that's not just due to their sky high heels