Is AUTHOR wrong in the post ? POST : Not a long story but tl;dr at the bottom.

I have (well, had if you can say) a friend who's a transgender. And we built quite a good relationship with each other, and I really do respect her decisions and give her compliments about her looks sometimes.

So she usually sends her selfies on Twitter, and one of those tweets kind of look like her other friends (let me call him S).

And I replied that she kind of look like S, and in response, she said that it was disrespectful as S looks and indentify as a male.

Nothing too serious has broke out but I really feel like I wasn't wrong here. So good people of the internet, please help me. Because I really want to be in good term with her.

Tl;dr: friend who's a trans, accidentally called her someone who looks like a male. She gets mad. 