Through my experience, I’ve addressed microaggressions by setting a boundary and outright saying that whatever comment made was insensitive. The most effective tactic for those committing microaggressions and passing them off as jokes is acting dumb and making the person explain the joke, they soon realize how ridiculous their comment is and become embarrassed realizing that the comment they made was inappropriate. The second tactic works at least 80% of the time. I’ve been able to use these tactics as both a target and a witness.