The meaning of left an right changes wth time but taking a snap shot of the current time; to be left means to think that all people are the same, while being right means to think that things like race and gender result in immutable differences between people. The extreme ends of these positions are both hilariously stupid. The left think that a man can become a woman by saying that he identifies as a woman and that he will thereafter experience periods and pregnancies just like a biological woman. The extreme right are racist and believe that all white people are smarter and less violent than all black people and that all woman capable only of wifehood. Both positions are wildly wrong and do enormous harm. We have seen racism and sexism2 play out and are currently seeing sameism1 play out. It looks like sameism might be worse since it destroys everything while racism and sexism merely results in missed opportunities. Since these missed opportunities will never total to 100% then we can say it's less bad than sameism. But I make that point only to highlight the contemporary importance of this topic. The correct opinion obviously lies somewhere in the middle.
Sameism/Leftism is fundamentally a feminine belief system. Women are weak physically and therefore try and make themselves as likeable as possible in order to gain the protection of others. Having an opinion is risky since it will cause people who don't share it to dislike you. The opinion that everything is the same is a very safe opinion though because under no circumstances can it make you look like a bad person. At worst it makes you look stupid which is actually a good thing if you're a woman since men automatically protect those in the greatest need of protection.
Racism/Rightism is fundamentally masculine because men are optimised to recognise patterns in the world around them since it's their job to protect which is largely a task of predicting the future. It's a lazy/stupid man though that is unable to recognise when the model they use to predict the behaviour of groups isn't applicable in specific cases.