With you on this. Would much rather be sat in my seat reading the paper with my stuff in the overhead locker than stood behind multiple people not realising the rows are in number order, trying to find a space to put their too-big 'hand baggage', eventually finding a space, stuffing it in before...
Happens all the the time at work........particularly getting in and out of the lifts (I’m in a 42 storey building so tend to spend a lot of time in lifts). I’d guess maybe 30% acknowledge, the rest ignore even when it’s obvious. Younger women definitely worse.