I don't think so. If you want to meaningfully drag down everyone in class then ask lots of pointless questions about minute details. Keep the conversation going for 5 minutes. Then do this three times per class. If you have 3 people like that in your class then expect to learn nothing.

Students with physical disabilities are usually very expensive to accommodate but not stupid or annoying. They might "ruin" their own education but not anyone else's.

How so?