Why is “girls supporting girls” accepted but “men supporting men” (if it existed) wouldn’t be accepted?

Anonymous
”Girls supporting girls” is purely sexism as it is based off of siding with women purely because they are women. Since that would be the same with “men supporting men” it would be called out by every feminist under the sun about how sexist it is. Why is it ok for women to be blatantly sexist and not get called out for it?
Why is “girls supporting girls” accepted but “men supporting men” (if it existed) wouldn’t be accepted?
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