Just to caveat I know this isn't everyone.
So far in 2.5 hours.
Someone listening to the news on their phone without headphones. I could hear every word clearly about the stabbings and there were young children in the carriage too.
Several people coughing, spluttering and sniffing galore.
People allowing their children to shout, scream, sing loudly.
People shoving the blinds down without checking it's ok when it's a shared window (ok this one is pretty minor).
Someone playing videos loudly.
The toilets have pee all over the floor and they stink.
People with feet on the seats.
I could probably think of more. 🤢