I have had to tell people in front to sit down before, only because they were blocking the view of my 6 year old. I picked seats in an area I didnt expect people to be standing much, and they dont, but now and again for big games such as the Everton one twats turn up and show no respect.I have had people 30 years younger than this old twat telling me to sit down. I have trouble standing for 90 minutes so have the occasional sit down. That is why rail seating in safe standing areas is a good idea, it gives you something to lean on. I find the ideal height for this would be the height ofthe bar in my local.
For me if you buy your passes anywhere near the away fans, or the 'singing' area you cannot grumble if the person in front is stood up all game. There are plenty of options for sitting without disturbance such as South and West.