My feelings haven’t changed much since: I still prefer if nudity is shared by all people present. I’m more open-minded, however, about textiles accompanying their nudist friend or S/O; if they’re cool with me, I’m cool with them.
The two situations I presented, I also realize, were a bit unique. In the first, we were a group of nude people who had just spent the entire week-end completely nude; and here walks in a completely dressed lady! Which sort of broke up the nude vibe we were all enjoying.
The second situation was genuinely a “chickening out” situation. My friend, or so she said, intended to join me but totally froze up (self-consciousness kicked in). She had no rational explanation for it; but I think it has to do with the whole “easier to be nude among strangers than with a friend/relative” thing. Her daughter came in the picture only a while later, asking why we weren’t nude; her mother explained that she had chickened out. Which caused her to also chicken out and return with a bathing suit on!
Since then, I have found myself in an “only nude person in the room” situation once or twice. In those situations, it didn’t bother me because those were people who typically went nude, just not in that particular situation. One was on a chilly morning at the resort; sarongs and T-shirts everywhere except me. The way I looked at it: “I didn’t just drive 90 miles to keep my clothes on! No way!” Another time, I was over at a friend’s house and he invited me to make myself comfortable. Why was that different from my second scenario? My nudity didn’t affect him as it had my friend. No worries; no intrusion? Then no problem.