Image creators can now see who reacted to their images and when in the creator studio. Just go to creator studio>analytics>content and see the images. If you want to check a particular image, you can reach the creator studio for an image you posted by adding its ID (seen in its URL) to the end of this URL
https://creator-studio.civitai.com/analytics/content/image/
Edit: Surprisingly the user that reacted to all my images with 😢 not only had actual content posted, but was still active (just not reacting 😢 to everything I posted) after every image I posted stopped getting their 😢 (though is explicitly inactive now). Honestly didn't expect that.