Person 1:

Technically not an accusation, Trump lost the lawsuit to Jane Doe. When Trump denied the allegations and accused her of defrauding him, he got sued again for defamation.

Trump raped a 13 year old girl.

Person 2:

Aren’t those different cases?

You:

Sure, the guy who says his friend likes girls on the younger side and that they are okay with it deserves the benefit of the doubt. Excuse me while I throw up.

The person 2 wasn't even giving the benefit of the doubt, they were just confused about what case the earlier person was talking about (likely because Trump didn't lose the mentioned Jane Doe case)

Person 3:

This particular case is, technically, an accusation, though. Even if we’re all just about certain that it’s true.

You:

Sure, I heard he totally respects women’s rights. He would be never think of purposely walking in on a young girl changing… Ohh wait

Person 3:

Did you even read what I said? I agree with you there. But technically, and I’m only bringing this up because you originally did, it is an accusation.

I think here Person 3 thought you were Person 1 who originally said the "technically not an accusation" thing.

You:

Suuuure, I am just calling bullshit on it. You are okay, even if your playing devils advocate to a rapist.

That's when I commented. I really don't know how this looks to you (and it gets worse from there) but nobody was playing devil's advocate, nobody was giving benefit of the doubt even, there was no rape apologia. I'm not sure if it was meant to be a joke on your part but it just seems like you misinterpreted what was being said and flew off the handle.