Trolling a Furry about Their Tail

Okay, so here's the deal, smoothbrain. This meme shows a chat where one person, Blach66, is basically messing with another user, Yuri. The joke hinges on the assumption that Yuri is a furry, and furries have tails. Blach66 makes an absurd claim that Yuri uses their tail for, well, you know, based on nothing but the fact that furries are involved. The humor comes from Yuri's completely confused reaction, which shows Blach66's trolling worked. You probably didn't even catch the furry reference in the post's context, did you?