Aye, rightly or wrongly, the current laws say "no standing". I was never in favour of that, and would happily support in changes that would reintroduce standing areas inside grounds.
For now, however, fans no don't have a leg to stand on (no pun intended) when it comes to these arrangements as the law is pretty clear. The club turning a blind eye doesn't change the law, as stupid as we think that law might be.