DY is correct, but the topic requires sensitivity.
The pull of movies and videos is very strong, and like many unhealthy activities – a common response is to be defensive. It’s not only language and inappropriate content that make movies – maaves (as Reb Avigdor Miller supposedly called them), it’s the whole ideas and krum perspective they give.
However, even if it was wrong – it’s not appropriate to push people away.
Jews that used to use razors in Western Europe, women who did not cover their hair in Lithuania, drinking cholov akum in America (before R’ Moshe), milking cows on Shabbos in Israel – the list goes on and on. In all cases, the Rabbanan of the time might have decried it, but they surely did not throw people away. That’s wrong and not the derech hatorah (or so I think.)
The main issue is that a person themselves has to understand and recognize it is wrong – and not without sincere thought. How does a person feel after watching – uplifted? inspired? energized? Consider the shortness of life and what is the proper use of one’s time. Until one has themselves concluded that it is wrong, it is an aveirah to pressure them to stop. It is a mitzvah in the Torah to try to to protest a wrong action – if they will listen. If not, it is a mitzvah to be quiet. In this case, perhaps come up with other, less threatening ways to help people – especially focused on those like the original poster who wants to stop.
DQB