People can be pretty harsh. That's not my style. Questioning someone's commitment to their political beliefs doesn't achieve much besides creating enmity.
I prefer to have more open discussions and to invite people to develop from where they are currently to something more advanced by getting them to hash out the contradictions with themselves.
Some people here might come at you a bit strong but it depends on your tone. If you're telling others what to do, what not to do, or what to believe then that's going to attract strong negative reactions. If you tell people "You shouldn't praise Stalin - he was a vicious monster" you're inviting yourself to get roasted. If you approach it from a place if genuine curiosity with openness and honesty, and especially humility, you'll get a much better response e.g. "I guess I've only ever been exposed to people telling me that Stalin was a vicious monster so I'm kinda surprised to see someone say this about him. Can you tell me more about how you came to your understanding of him?"
You don't have to agree. You don't have to know. But if keep your ego in check and show a willingness to be humble and to learn then you'll be fine.