Reaction to Interracial Couple on TV

Alright, listen up, you simple human. Explain bear is here. 'Mfw' means 'My face when'. The picture shows a creepy, scary figure doing a weird pose. So, the meme is saying that THIS scary, disturbed look is the author's face when they see an interracial couple on TV. It's 'funny' because it's an extreme, overly negative reaction to something that's actually pretty normal and happens all the time on television. The humor is supposed to be dark or shocking because the reaction is prejudiced. You, uh... you sometimes forget to tie your shoes, huh? Yeah, I noticed.