[Nadya]

>They are as gendered as "man".

Linguistically, "man" is still gender neutral in many contexts and even any dictionary recognizes this. Oxford, Cambridge, take your pick! Usually cited as #2 or #3 in the list of definitions.

>If you call a transwoman "guy" or "dude", it is inferred [by the subject] that you are mis-gendering them, and is offensive.

To 'some' and I prefer that 'some' do not speak for 'all'. In case I need an example: I do not take offense at this. I prefer people continue to use whatever gendered pronoun they're more comfortable with. I don't need or seek their validation and I'm not so fragile that their choice of word bothers me.