Having spent an enjoyable weekend in Koln I went to Dusseldorf Airport to fly home to London on BA. At about 11.30 am I passed through the Security for Gate B35. All was normal, watch, boots, coat, fleece, hat, laptop outside, etc., all had to go in trays - until an aggressive security guy told me in German (which I do not speak) that I had put my walking boots in the wrong tray..I thought I'd misheard him and asked him tell me where they needed to go in English please. He then said - in a sarcastic tone "I can see you are English by your face" - I thought that that was an unnecessary and racist remark. I then had to go through the X-ray machine, I did not like that because I have prostate cancer and radiation is not good for me. After that I then asked for a supervisor to complain about the racist remark. But then another security guy turned up and demanded that he body search me. During this he demanded that my jeans belt be undone and my flies be opened, so that then my jeans fell down exposing my underpants. He then fully and extensively body-patted me included fondling my genitals. I deemed this to be sexual assault. In fact he did this 3 times. I had made a complaint about a member of staff and they were giving me the works - b######s. Meanwhile the police were called - but they stood around doing nothing. I complained again about the racist remark. Suddenly no-one could speak English. One police-women took my passport away, and asked if I wanted to make a report. I said yes, and I was allowed to write a few words in her diary!!? During all of this the racist guy kept my laptop - I thought he was going to damage it or refuse to give it back. He then swabbed it but that came back negative. When I had to ask him for it back I said was he going to apologise for his racist remark to me. He said no and that he was a racist. I was then allowed to leave. This incident has upset me a lot - I thought Germans were not racist. They are. And it is disgraceful and unprofessional that a member of the Airport Security should be racist towards English airline passengers, and to admit this in front of his colleagues and the Airport Police (who did nothing).