It's white people's responsibility to stop racism.

It's men's responsibility to stop sexism.

It's cis people's responsibility to stop transphobia.

It's straight people's responsibility to stop homophobia.

It's able people's responsibility to stop ableism.

It's always the responsibility of the people in a position of privilege to stop the oppression they are benefiting from.

If you are part of a privileged group, in one way or another, get to it.