"Indignation" was a poor choice of wording, then -- I take it back.
Still - it does seem to be such a trifling fault with the article that it seems strange that it would be seen as worth devoting the time and energy to call out. When I come across minor hiccups like this (either in something I'm reading, or when someone is giving a talk) I usually just say to myself:
"Mmm -- but was it in good faith at least? Not too preachy / overbearing? Yes? Then let's move on ..."
Still - it does seem to be such a trifling fault with the article that it seems strange that it would be seen as worth devoting the time and energy to call out. When I come across minor hiccups like this (either in something I'm reading, or when someone is giving a talk) I usually just say to myself: