Also worth pointing out that post war Roma and Sinti people were still persecuted. They were the only group not entitled to any restitution from the German government because they were not accepted as a race. It wasn’t until the late 70s they got the same recognition as other victims.
Even now (or in 2017) Jewish holocaust survivors in Moldova were getting €350 a month as restitution from the German government and their Roma counterparts were getting €15
www.timesofisrael.com
From reading the reaction from the Roma community, it seems like this is one of the most hurtful aspects of the joke - they feel they are the last acceptable target. Carr wouldn’t have said it about Jews, or Gay people, or the disabled, but joking about Romani being murdered in their hundreds of thousands is still fair game.