Images aren't working for me: I can't see the images, but I can try to answer the thread title: Spoiler: Google search results
It means "special education", its making fun of students with disabilities. Its a stereotype the people in special education are stupid, or mentally retarded. He's basically saying you are " dumb"
It's basically a terrible insult, and people can actually face a fine or prison under legislation in the UK, under the malicious communications act of 1988.