can someone explain this in plain English? I read the tweets but I don't get it. Thanks.
Some meet-ups and projects had a problem with people being fucking arseholes. They developed "codes of conduct" to help them deal with those harassing abusive people.
This woman gave a talk to this meeting. She described her experience of working in open source. She was careful to say it worked for her but might not for other people; she was careful to say that it was anecdotal.
Someone at this meeting thought that she should have given stronger warnings about open source. That person is saying that by not giving the bigger warning the speaker was performing a micro-aggression against all the other people who've had poor experiences in open source because she was supposedly erasing their experience.
They're saying the speaker violated the code of conduct.
When the speaker asked for clarification the meeting organisers didn't apologise for making a mistake; they persisted in their description of the speaker as someone who violated the CoC.
So, that's roughly what the meeting organisers think. Clearly, they're wrong. Micro-aggressions are a thing and they're something we should be mindful[1] of, but this isn't an example of a micro-aggression. And there's a difference between a woman saying "I had a good experience in open source, but other people might not" and for example a man saying "there are no problems in open source development you just need to toughen up".
[1] Mostly because people who are oblivious to micro-aggressions tend to be taking discriminatory actions that potentially leave their companies open to lawsuits.