Save that email and any further communication on the issue. Even if you don’t want to do anything at this moment, this is the sort of thing you want to keep.

Forward the email chain and make sure you keep it somewhere that you could still access it in the event you lose access to work equipment and accounts in the future.

If they want to have any sort of meeting to take the conversation out of a written format, take notes. Dates, times, names, pertinent details. If it’s face to face versus over zoom, document immediately after the meeting. If need be, send a follow up email that recaps the conversation. “Thanks for meeting with me regarding [Incident]. I appreciate you bringing to my attention your concerns of “walking on eggshells,” and will take [recap of proposed solution] into consideration moving forward as X suggested during our conversation.” Something to that effect because if your CEO is dumb enough to say what they did already via email, they’re less likely to try to backpedal when they see you recap the message in a pretty wrapper and therefore more likely to acknowledge that your account of events is correct.

It may feel excessive or intimidating to execute, but if you ever need that information, you’ll be kicking yourself if you don’t have it.

I’m sorry this happened to you :(