They take the bottle tops off for rugby league fans as well if that makes you feel better?
If you're talking about alcohol consumption as a preferential treatment then that's something you need to take up with UEFA, not the RFL or the Dept for Culture, Media and Sport who brought in the bottle top rule to try and save a few broken necks. UEFA are the ones who dictate the guidelines on alcohol consumption and the FA who follow them and ban it from the view of the pitch.
I can't think of any other preference Hull FC get you may be referring too. The whole stadium is decorated like it belongs to City, including the coroperate boxes and bars, and the fans only get the same food and drink offerings.
The law dictates the restriction for people not to be able to drink alcohol in view of the pitch. The Sporting Events (Control of Alcohol etc) Act 1985.