The recently I talked to a Chinese banker in one of the biggest Chinese banks. We where walking around a beautiful park, which also had a public library in it overlooking the park. A very nice public space overall. Anyway, in the library there was a stack of The Governance of China (third volume) by Xi Jinping on one table. So we talked about it, and it turns out the bankers in China read this book, have classes/study sessions, and try to find ways to implement Xi Jinping thought. Imagine calling a country capitalist when bankers read communist theory and have study sessions for it. That’s China; not a capitalist country, but a socialist country where the party is doing it’s best to develop material conditions, and they have largely been successful.
You will always be fighting an uphill battle in the academia of the imperial core. Global North historians in particular are on the front line of anti-socialist narratives. Of all disciples, the narratives of hustorians are probably the most powerful propaganda against radical though in the imperial core. Keep in mind that your professor is likely not sympathetic to leftwing thought, let alone socialism. This is compounded by the fact that even if they where, the structure of western academia makes it almost impossible to be a genuine Marxist that is critical of society. You won’t get grants, promotions, etc.
Just know that you did your best to inform them, and don’t waste your energy any further. Don’t expect that professor to listen to reason or to genuinely consider your sources. As soon as you are outside the imperial narrative, they dismiss your opinion and sources as fringe. Why? Well, if they engaged honestly, they would have to change their mind.
Try to concentrate your energy on anything that will produce results and benefit you and the mouvement. Read, stay healthy, educate yourself and others. Organize if you can.