Well, one of us is misguided. It can't be both the shia and the sunnah is right but how to convince them that ?
You need to look for the proofs.
And in Jeddah at school I had many shia teachers working with me but I never really got into the shia-sunnah discussion because everytime it happens both sides get into a battle and tbh...sometimes you need to just respect other people's religion or beliefs and move on. If you can't prove to them the truth or convince them and if you do not have the enough knowledge, then just discussing it will create a conflict.