I haven't really experienced any discrimination, just some disgruntling looks when I take my seat in 1C.

Actually checking into the SF Doubletree 2 weeks back was the best. Being Gold VIP w/ Hilton I was given a little box upon my arrival. An older gentleman (in a suit) checking in next to me asked why he didn't get one and only got the chocolate chip cookies. The employee checking him said, "You're not a Gold or Diamond VIP." Looking at chexfan wearing jeans and a fleece, he replied, "And he is?" With perfect timing, the person checking me in presented me with my complimentary breakfast coupons and said, "Enjoy breakfast tomorrow morning Mr. Chexfan." With a smile, I said thank You and walked away.