Tell me if this is right

So Chris’s dad had invited me to go with them to Chuck E. Cheese, as long as Chris talked to his step-mom first. Chris agreed. He told me about it and I was sorta happy, mostly because I was going to get to meet his parents. He then told me that his family was retarded and that they weren’t going to go tonight. I understood that, his family does do that. Later, he texts me and says that apparently they were going to go, but his step-mom didn’t want me along. Is that right? His step-mom and even his dad always makes some sort of assumption about us. They’ve given him the sex talk more than once, and him and I decided we weren’t going to do that sort of thing for a long while. (I’m choosing to remain abstinent. ) Am I overthinking this? Should I really be as irked as I am? Because I’m pretty irked.