How to respond to my teen

You guys have been a wealth of information for me as a mom with no bio children and an adopted son who was adopted as an older child and hates me. I'd like to know how normal parents respond to situations.

If your teenager is mad at you from the night before and walks out the door to go to school the next morning without saying bye to you, or acknowledging your existence when they walk right by you, do you ignore that stuff? I just want to text him and be like umm Did you forget to say bye? I'm sensitive, so I'm hurt by a lot good behaviors and getting really tired of being treated like crap.