She did give a lot of people a lot of reasons to dislike her. She pissed off essentially everyone in the north over the miner's strikes, everyone in Europe and Ireland over the IRA. She supported the brutal dictatorship of Pinochet long after he was deposed and convicted of crimes against humanity. She called the ANC a terrorist organization and refused to impose sanctions on South Africa long after the rest of the west had and she even took away free milk from kids in state sponsored schools! So, not trying to justify dancing on graves, but plenty of people have plenty of grievances.