There are a lot of false stereotypes thrown about, a lot of toxic mentality and a lot of skewed views due to the place you live in/ your environment and the society you're in contact with. A lot of these misconceptions can be harmful to people and can lead to unfortunate circumstances.
So what sort of thinks do we really need to stop thinking, no matter how insignificant it may seem?
Examples would be that people should really stop seeing feminists as man haters, or Islam as some oppressive religion, or that gay men are always flamboyant, and that anything that has the colours of the rainbow to be taken as LGBT+ related, or that Nicki Minaj is a terrible human being, or that the reason for a headache is being on the computer too long [[Looking at all the parents here]]
I realise that there's risk of argument here and there's a very high chance the thread will be closed due to this, I urge you to keep your mind open and to accept that people have different opinions, and that even if some opinions are wrong you cannot change them via a spat on the internet.