call in culture isn't meant to replace call out culture. call in culture is for members of your community who you already trust to exercise accountability. it's for talking through power structures within a group of people who already have committed relationships to one another. for example, if someone within a group of women voices an opinion that's misogynist, someone might take her aside and call her in, asking her to understand why her internalized views might be harmful to others and herself. if it's the same group of women but a cis woman says something transmisogynist, you can't call her in privately without betraying the trust of the trans members of the group.
call out culture is for those with active and oppressive power over you. racism and sexism are public institutions and addressing them as private dramas within individual relationships will not work. when someone is reinforcing the racial privilege they already have, upholding sexism, being transmisogynist, the right tactic isn't to pull the oppressor aside privately. to do so is DANGEROUS and puts all of the vulnerability and danger in the person of the oppressed group. if someone has been acting really shady sexually, abusing their power etc, for example, they need to be called out publicly. it's not up to someone who was subjected to harassment to pull that person aside, talk to them privately to protect their reputation, while actively putting their body at risk. to think that call in culture is more compassionate than call out culture relies on assuming the goodwill of the oppressor (that they didn't mean to assault someone, they were just playing around) and the malevolence of the complainer (that they're petty or jealous and trying to take someone's career away out of spite).
call out culture and call in culture are meant to exist side by side. call in culture isn't supposed to replace call out culture or be a better alternative.most of the time, when you try to "call in" a white person they get fragile really quickly. if they are your boss, you will suffer economic consequences. if they're part of your friend group, you suffer being ostracized. call out culture makes the issue known because oppression is something that every member of your group must have some accountability over. oppression isn't private business between individuals.