there's a lot of hate against trans women specifically and while femboy isn't one of the worst things ive seen its super harmful actually and shouldn't be used to describe them!! saying "femboy" in reference to a trans woman suggests they are not real women but instead men parading around as women!! i am not a trans woman myself so i can't say i know how it feels but i would think it's akin to (if not just) being misgendered

another thing don't use the term trap!! also suggests trans women are not real women with the added punch of saying they're being predatory by 'pretending' to be a woman

might also be a bit iffy to use around trans men bc of the "fem" part so i'd also. avoid doing that one too unless they say they don't mind and are comfortable with it !! usually why i avoid saying femboy at all unless i know the person isn't trans/is ok with it