I'm not sure that might just be how he speaks, he seems to do a fair amount of non-mandatory PR engagements if he really didn't like doing them. I read his mood

I'm not sure that might just be how he speaks, he seems to do a fair amount of non-mandatory PR engagements if he really didn't like doing them. I read his mood as more "excited energy" from an unpolished public speaker rather than distinctly unhappy to be performing, he came up from the scientist track rather than the pilot/military track for astronauts which can also explain it somewhat maybe.