Anyone else been told this before? It seems a bit transmisogynist to me imo

It's just how chemicals interact. I think if you eat/drink things with activated charcoal in it it can also mess with hormone supplements like hrt and birth control

I have had significant feminizing effects even on tobacco though, so I kinda doubt it., Plus, it is mostly unsubstantiated claims that say it negatively effects HRT, most oldheads will tell you otherwise. To be fair...