There is a big difference between showing respect on a fan forum and at a game when the less literate of their fan base is full of alcohol.
I know this makes me old fashioned but I would have preferred a minute's silence to applause. It is more respectful and in the absence of noise the reality of the collective loss we suffer from the person's departure fills the space .
I think a glance over to the away end during the applause will confirm the vast majority of their fans joining in.