No ALL women (irrespective or culture and religion do that). In the workplace, I’ve seen white women screw each other over through their words and actions.
Could be insecurity which causes jealousy. Could be an idle mind seeking drama or entertainment.
Are we united ALL the time? No, not all the time. I’ve seen examples of women (desi or otherwise) that may not be so crazy about each other…but will come together in times of need…lend a helping hand. Biological sisters can act beetchy with one another but can also be supportive as well. So, it’s unreasonable to think that women not related to you will be “sisterly” at all times. Human nature is not consistent.