Why does my autistic brother not seem not to be able to connect with his emotions?

They do have emotions. They just dont know how to express it the same way. If he can experience anger (which is an emotion), then he can experience other emotions. Anger and frustration are just very common because this world is so confusing for them when most other people seem to be in a different world. Can you imagine living in a foreign country. You dont understand the language, the norms, the rituals, and no matter how hard you try, you are only able to ever figure out just a small part of it. And as for the empathy part, a lot of people with autism miss cues. 90% of what is being conveyed in a conversation is through non-verbal language. Since they have a hard time with non-verbals, they pretty much miss out a lot of what is being communicated, especially the emotions part. They really just dont recognize other’s emotions.

cause thats pretty much what that is

very well put! My brother is also autistic. There is tons of information on Pubmed central about autism. A few titles I found interesting:

Helping and Cooperation in Children with Autism

Symptoms and Behavior Problems of Adolescents and Adults with Autism: Effects of Mother–Child Relationship Quality, Warmth, and Praise

Social Stimuli Interfere with Cognitive Control in Autism