Its nothing to do with assumption that white drunk man respect women more than an indian. Its all due to our conservative society. How many times you have seen group of 4 guys and 4 girls together for a celebration or party. When you have a group of only man...they simply can't bear the idea of someone else having a women with them and start what they think is fun for them. Infact it is frustration...Reason nothing like this happen in western countries is because of equal ratio of man and women in party revellers. Guess that's why night clubs in delhi only allows couples or groups with significant number of girls.