I would say that, if there are times when people aren't nitpicking, and times when they are, I would look at maybe why.
For instance, I can only speak for myself as a casual SW fan. I didn't care in the slightest bit about the gravity in the worm monster thing because I was so engaged with the plot, the characters, etc, that it just didn't matter. However, I did actually notice and think about the gravity of the bomb dropping moment in TLJ as well as how Rose' sister was able to so freely breathe in such an environment. At the time, I wasn't even a little engaged with the plot, the characters, etc. So the flaws stuck out to me more.
I think that's a big issue. I don't think it's fair to assume or imply some ulterior motives for people who notice and complain at times but not others. Sometimes the movies are good enough that we don't care, and sometimes they're not.