From the TV you could hear a few noises, which then gets booed and makes the whole thing sound worse. Don't know if the noise was from late arrivals not knowing what was going on. Can't imagine anyone would intentionally show disrespect.
I believe that all football teams should make it very apparent in advance not just on screen and announcement and in programme but by including it on the printed or digital ticket. It's a time for honouring and expressing gratitude. Be it outlining what needs to be done, with applause or quiet. It should be mentioned that following the period anyone found to be disrespectful will be removed from the area.I believe it's terrible behaviour and that the players' families especially and supporters who are especially fond of a player have to go through hearing foolish people disrespect or lack of information or interest for some spoiling that at a time when the stadium should be the calmest, most reflective, and a time for being it prayer and /or reflection of memories.