I wasn't a White Glove when I did this, myself.

Don't know if this matters or not, but I wore some White Glove armor. I forgot who I got it off of. IIRC, I was jumped by some White Glove dudes, so I took the armor off them. Anyway, put on the White Glove garb and go past the two guys with the flamethrowers. If you don't attack them, they won't do anything to you. (If you don't have the White Glove armor already, go ahead and kill these guys and get it from them.) Going forward, you'll run into a White Glove who asks you what you're doing. Pass a speech or repair check to get past him. Find Phillipe. There's a certain speech path (don't know any other way to describe it) to get him to go into the pantry. Kill him there. Get his recipes off his dead body. Close the pantry door. Cook the fake human meat. Use the intercom to get the waiter to come get the food. Hide somewhere and watch him come and take the food. Wait a minute or two and let him walk out of the room and into the Members Only Area. Go get Ted Gunderson. Again, not sure if it matters, but I used the speech path where I said Mortimer was the one to blame, not the entire White Glove. Now, with Ted following you, go to the Member's Only Area. If everything went right, all the ticks on your radar should be green. No red ticks indicating enemies. Hide and let Mortimer finish his entire speech. If you confront him too early, it screws things up.

That's it! Good luck.