the return flight from Frankfurt to Portland was with one of their 'Star Alliance " partners, UA. It was a disaster! From the wait at boarding time, where a rude man ordered us to stand in line for over 1/2 hr along the moving walk, pushing me when I 'fell out of line". I have a bad knee and really would have preferred sitting in the boarding area. We tried to get to our seats after finally being allowed to board, only being pushed around as the attendants were serving the business class travelers their drinks... One meal and one round of liquids offered during the entire 12+ hrs flight. When I asked an attendant in the back for a bottle of water, I was ordered to get back to my seat. Writing a letter to Lufthansa with copies to United Airlines got us a response of 20% discounts on our next flight if taken within 12 months. It will be a cold day in hell before we fly UA again. Have other travelers experienced such out and out rudeness, and what else can a person do to effect some changes? This was unacceptable!