Autistic person using autism as an excuse?

I see posts in different threads from people blaming some shortcoming on their autism. That doesn’t seem like an autistic thing to do. It seems that an autistic person would have what they think is a valid reason for why they took some action good or bad. Is it normal for a truly autistic people to blame their autism?

Edit: Thanks for all the helpful responses to help me understand autism. To those that were offended and are autistic, I’m very sorry. As for being labeled an “ableist”, I’ve been diagnosed with anxiety and depression, my aunt, uncle and sister were schizophrenic and my uncle and cousin committed suicide. I’m not heartless. I made an observation and asked a question.