how do you handle disrespectful behavior?

So oftentimes my H speaks to me or treats me in a manner i find disrepectful and/or immature. First example... hubby has found a new hobby he enjoys - cycling. We both bought bikes and rode at the park over the weekend and had a great time. So on Tuesdsay, I get a text message from him while I'm at work asking if I wanted to bike in the park after work, it's a nice day out. I replied that I would like to but I have a 7pm appointment so will not be home in time. He does not reply. On my way home after the appointment, I decided I want to pick up dinner for both of us. I call the house phone and he doesn't answer. I know he's home and I think maybe he fell asleep. I call another 5 times and no answer. So I just pick him up what I think he'll like. I get home and he's sitting in the bedroom playing a game on the ipad. I told him I picked up dinner. He replied that he didn't want any. I then ask why didn't he answer the phone. He responded that yes, he heard it ringing about 5 times but knew it was me and didn't feel like getting up to go answer it. He said he knew it was me calling about something stupid like picking up dinner, so he didn't bother to answer it. I asked him again why he didn't pick up the phone...he knew it was me, and what if it was an emergency? He said if I was able to call then I wasn't dead so it's not worth getting up to answer the phone! He also said he was pissed that I "went ahead and made other plans" and therefore couldn't go bike riding. My appointment was made a week in advance. To me, this is very immature behavior. Then last night, I misplaced my house keys. I have struggled with ADHD my whole life, and misplacing things happens from time to time as a result. Never lost my house keys though. So H goes on and on about how he has to change all the locks in the house now. About 10 minutes later he asks me "why are you such a loser?" I told him I'm not a loser and I dont' appreciated being called that. he said "you should feel like a loser, you should feel retarded and stupid because you can't find your keys and now I have to replace all the locks" This really hurt because most of my childhood I was criticized by parents and teachers because of the issues caused by ADHD which no one knew existed at the time. But my H should know better, he knows I have this condition and it's been a lifelong struggle. Other than responding that I don't want to be spoken to in that manner, how else should I handle the situation? I'm so tempted sometimes to stoop to his level but I know that's not the best way to handle it!

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