Apparently 19 euros entrance tickets are not enoug...

Apparently 19 euros entrance tickets are not enough for buying enough paint to decently display that pictures are not allowed. (A sign of notebook size in a room as big as a basketball court in ground floor room for instance). Instead of improving an obviously unclear indication the rude staff prefer to yell on on everybody who takes a pictures without to know the rule (it happened four times in something like 5 minutes when I was in this very room.) You have this rule while it doesn't exist in most of other museums ? Fine but make it clear. Also guides they yell on people not being on guided group if they stay close from the painting when the group arrives. God worst museum ever so far.