I’m actually from Germany, I currently live in the federal state of Hessen. The far-right party did get 16 percent in the elections yesterday (not quite 30 but thats still a lot) but it should be noted that a good portion of their voters seem to be voting out of protest.
Maybe its different in the countryside but I live in a big city and I personally have not experienced any racism (including from older people), some friends of mine have but its certainly not common. Thats still bad but I dont think its worse than in other countries…
Cant comment on East Germany but its certainly not normal to make racist jokes (or jokes about disabled people).
I dont want to make assumptions but it sounds like your perspective on Germany comes from a single person whose experience isnt really representative of Germany as a whole… just my thoughts.