I understand what you mean. my family is from Ukraine , and we moved during the time it was still apart of the Soviet Union. When I was in Hetalia fandom, I got a lot of people asking me if I wanted to RP Russia/America "hatesex" and Russia/Ukraine abuse type stuff (because we are Ukrainian) and it was what drove me out of fandom. It wasn't cool , and I said that , and people kept doing it. Just because it's history doesn't make it fair game , and finding out what it was like to personally have your history totally taken advantage of for some fangirl roleplays is not a good feeling at all.
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