I have heard this too many times recently.
We're in the midst of the largest civil rights movement in the history of this country right now. Whether you support minority groups who have been continuously oppressed is not "just an opinion." Wanting to get kids out of cages is not "just an opinion" either. Neither is not supporting a racist, pedophilic, transphobic, islamophobic, xenophobic. anti-Semitic. and homophobic President with over 40 sexual assault allegations. Wasn't that a mouthful?
Those are not opinions.
Those are morals.
If you do not see something morally sick and twisted about supporting a man who would rather arrest 10,000 nonviolent protestors than the 4 cops who were on video murdering a man, I genuinely don't know what to tell you. Blindly backing a man who "grabs them by the pu**y" and condemns TikTok rather than the KKK, does not grant a moral high ground you get to judge from. Do not feign moral superiority over people who actively speak out against oppression while you perpetuate it through silence. It is so much deeper than a differing point of view.
Personally, as a woman, as a person of color, as a product of immigration, I do not want to surround myself with people who do not believe in my right to exist. Your "harmless political opinion" actually infringes on multiple aspects of my identity. It is not harmless, and it is not just an opinion either. So no, standing up for equality is not immature. And if you think it is, if you think equality can be debated, you are the problem. Understand that human rights are not up for debate. If you think they are, you are so gravely mistaken.