Dating someone who has kids and doesn't really discipline them.?

[SMB]

I am new to dating someone who has children. I have a child of my own and my bf has two children all of the kids are boys. I planned a special night out with my son and my bf and asked him if he wanted to include his boys so they would not feel left out. They wanted to come and seemed excited about it (or from what he told me they were excited) As soon as the night began his youngest child asked non stop when we would be there. Being this was not my child and I believe that it was his place to discipline I did not speak up and say anything to him or his son about the constant "Are we there yet" Then when are we going to be there" turned into "Turn around now and take me home now Dad!!" and "this is the worst night ever!" every 2-5 min. I still did not say anything thinking his dad would tell him that we were trying to do something fun for them all and to stop being disrespectful. The whole trip (Which was an hour) was full of this. When we got there it was full of "I wanna go home now" which I guess his dad is use to b/c it didn't seem to effect him. This didn't stop until he got his way and got to eat dinner at the place he wanted to. It started up again on the way home every couple of min. it was "Dad how much longer". I guess my feelings were just hurt that his dad never once said something about how he was acting when I took the time to plan something for us all to do together and it made me think I will never plan to do anything with him and his boys again. I don't know if I'm over reacting or if maybe I should have stepped in and said "You are being a little ungrateful that we went and planned something fun for us all to do and all you want to do is complain about it." but I was waiting for his dad to say that. I didn't want to start a fight with my bf so I kept my mouth closed, but I am a little upset about it all and I don't really want to do anything with him and his boys for awhile. Am I over reacting?