There isn’t really much respect.
The key is that both of them are basically reading their scripts. Walz because he is inexperienced and vance because he has clearly been yelled at for saying stuff his orange overlord does not like. But they are both making it a point to key in on one or two words the other person said to make it sound like they are listening or whatever.
It was much more obvious in the first half hour, but vance is basically giving the same speech they would have given if Biden were still running. And Walz doesn’t have a good way to say “you do realize Kamala wasn’t the POTUS for the past 3.5 years, right?”