Socialism is an economic system. While that system encourages many other social changes, those changes are not necessary for nor are they obligate outcomes of Socialism.

Socialism is more than just a proposed economic and political system, but a movement or a process that aims to overthrow the current system to build the new one. As it stands capitalist class society, racism, patriarchy, heteronormativity, imperialism and etc are forms of oppression that are interwoven, they are class relations that are all fundamentally related and tend to amplify and strenghten one another; a movement that tries to challenge only "one" of them independently while ignoring the bigger picture of how all these things are related is a useless, dead movement because it fails to understand how the system works and can't mobilize anyone to take it down - people won't relate to a movement that ignores issues they face every fucking day in their lives.

Those social changes are yes necessary outcomes of any process that aims to establish Socialism. A Socialist society that still maintains structural racism, patriarchy and etc is a fundamentally contradictory society, and an ideology that wants to destroy all forms of class relations while ignoring most class relations that exist is a hypocritical one. How do you expect to rally people to change society if you ignore issues that well over half of the world's population face every fucking day? Do you think you can build a revolutionary movement that consists solely of middle class, white, straight, adult men in Europe and North America only? And if you don't, when people who fit outside of this demographic join in into the Socialist movement and feel like discussing issues they face everyday, do you think you'll strenghten the movement by telling them to shut up because it's 'off-topic'?

Are you honestly thinking of building a revolutionary movement that isn't "controversial"? Internet hysteria about "eebil SJW's from tumblr!" isn't what holds Socialism back. What can hold Socialism back is an inability to connect with what oppressed people actually experience, and an inability to effectively organize to deal with these issues.

And i won't get deep into the specific misunderstandings of "social justice" issues you made here because i doubt you want to get educated in them and you'd complain about me going off topic, but i will point out that your earlier comment about transgender people (your comment "like I am not a man but a male person, not white but a white person, not a heterosexual but a heterosexual person - just give me a break with your PC fail") is completely fucking ignorant and you are an asshole for simply dismissing what other people face when you have absolutely no fucking clue of what it is about. If you do want to be educated about this shit feel free to ask, but if you are going to keep belittling other people with out actually knowing a thing about the subject at hand, get the fuck out.