Hi, I spent a few years unpacking those feelings to figure out that I like crossdressing more than I like being the gender opposite my birth. One of the things that made it more confusing in the beginning was the slew of internet comments I would read reinforcing that any gender nonconforming activity was a sure sign I was trans.

If you know the person irl and they consistently show signs of being trans I think it’s good to ask probing questions that may lead them there, but I don’t think it’s right to tell them who they are. Better for them to figure it out themselves. On the internet you definitely don’t know the person beyond a single post, or a few posts coming from their online persona (not their personal self). This means you have even less right to tell them who they are.

Especially with the TM I took your initial comment as a joke, which I don’t find super funny anymore personally but can give a half smile and single roll of the eyes. Your edit about people unpacking their feelings implies to me that you were saying it in earnest though, which is where I start to have a problem for the reasons above. Just in case you want some insight on why you may be downvoted so much.