IRL, it would be topics like how the world is unfair and how people can get away with treating others like shit, yet when tried to call them out, they either feign ignorance, plausible deniability, and/or try to defend their own actions (in other words, reframe it as something not as bad). Another such topic is legalizing prostitution and drugs (I don't do drugs, but Idm others doing what they want to their own bodies as long as they aren't hurting others' with their actions). In regards to prostitution, my argument would be that it does more good than harm and that existing harm will always be around whether prostitution is legal or not. But by making it legal and regulated, it can reduce the amount of crimes, problems, and possibly even reduce depression and suicide and violence by some amount. Of course, the anti-prostitution people don't agree (nor the religious ones either) as it affects their ability to influence others and exert control. There are more contentious topics I have with others, but that is just one such example.