This is a delicate situation. Your parents obviously care for you very much. Despite being an adult, you’re still their child — that’s a tough transition to make for a parent (my daughter is about to turn 20 and I find myself still answering for her at the doctor, still constantly asking if she’s ok, etc… but I’m being mindful of it and trying to make the shift to treating her like an adult).
It sounds like you’ve already explained to them that you need a bit of time to decompress before interacting with them.
This article touches on the brain fatigue experienced after work:
Penny
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism