There’s no shortage of resources available from feminists, trans advocates and medical professionals online

If they’re so abundant and easy to find, then why not simply share them? You can also link the other posts that explain your position.

confidently spread their harmful ignorance

If he has such an uninformed position, it should be very easy to defend against it instead of wasting everyone’s time by making ad hominem attacks? Maybe we can make the internet a better place by not spewing toxic abuse even if one feels attacked by an opinion, no matter how uninformed it is?

You are defending your ideology in the worst way possible, and believe me when I say this, but you will never convince anyone beyond your closed bubble of why we need to move forward as a society this way.

How about you try to enlighten him then, instead of throwing verbal abuse at him. He stated his opinion and you are free to debate him on that.

The fact that he gets attacked like this for his opinion is why I don’t engage in these discussions. Your kind of reaction will lose all support for your cause.