You definitely could do more research since you disagree with scientific consensus on trans issues and think you know better how it aught to be.
I didn’t see anyone accuse you of genocide but from your other comments I wouldn’t be surprised if you did and just didn’t know it or tried to pretend you didn’t because of a technicality.
I do it all the time. I mainly do it to make sure I’m not arguing against a literal child. There’s many reasons why one might look at a person’s post history.