If you feel the need to interrupt a woman to explain how you as a man aren't sexist, you're probably not convincing your audience as much as you think.
The more you know.
(I'm sure this also works if I as a white woman were to interrupt a person of color to explain how totally non-racist I am: I would not be convincing. I'm sure I have done some things equally egregious. I'm not proud of myself.)
It's not an oppression olympics, folks. There's no competition about which culture or country is most oppressive. Who cares, really? You recognize oppression; you analyze it so you understand how it works, and then you work to end it.
If you start with feminism as a way to analyze gender oppression, that's a starting point. Then you have to work on doing something about gender oppression. And then, you need to use what you've learned to start analyzing other systemic oppression with a purpose to end oppression.
When we start congratulating ourselves about our own superiority in being non-sexist or non-racist or non-oppressive, then we're taking a couple big steps back in our work.