The image is a reddit post with the following text (automatically transcribed):
I remember I got into an argument on reddit awhile ago with a person over Italian food. It got to the point they were following me into other subs to harass me. I clicked on their profile to block them and their most recent post was them drinking their own piss on r/piss. At that moment I realized I had spent so much pointless time arguing about the taste of food with someone who drinks their own piss as a hobby. This site is a shit hole.
I read that you can see who voted on kbin, so it should be federating for that to work
Kbin is different to lemmy but activitypub only shares certain data. Looking at the tech info the primary server only shares the count to the federation but would know who directly liked it. https://www.w3.org/TR/activitypub/#liked
Again, without testing on my own server it is hard for me to say with 100% confidence.