I see nothing wrong in your approach. I feel very similarly. I do see exW on the weekends and from the pleasantries and other kids related things, I have nothing to talk to her about and I have no desire to inquire more about her life. I find it strange and contradictory when they want to be 'buddies'. Like they asked for a separation and divorce and wanted the LBS to get outta their lives. We're giving them precisely what they asked for. So no, I don't think you're being rude or disrespectful. If you want to be more than what it is now, that's up to you and I wouldn't ding you on that. But I personally don't see a need for that.
