Yeah, I used to have a hunting partner who did the "butt up and ease the lever" method on his Spanish sidelock. He put on cotton gloves to clean his guns - and took forever doing so. He also used a different load in each barrel, and missed many a flush while fumbling around reloading. He spent so much time and effort coddling his guns, he became a real drag to hunt with - I hunt with him no longer.
Close and handle your gun any way you wish, so long as it's safe. But please, don't go around giving lectures or dirty looks to anyone who doesn't subscribe to your method - unless you really believe God annointed you as the Great Arbiter of Gun Closing.
If you're really worried about the "correct" method, get a copy of the movie "The Shooting Party" and watch closely when the pro loaders open and close their masters' guns. See how many use the "butt up and ease the lever" method when the birds are flying.
