There's no operating joke in the statement-- you're just saying what you believe, as you've made clear. What you're doing is like saying "the sky is blue" and calling it a joke.
"It's highly subjective"? Absolutely-- that doesn't mean that there's any reason to seriously entertain the idea that stating a belief itself constitutes a "joke".
This isn't hostile. "Being hostile" might have included me accusing you of hiding behind the "joke" label to cover your ass, but I'm granting that you're brave enough to stand by your beliefs-- which leaves me with confusion about where your "joke" is.
It doesn't make a difference to my point, which is that the vague sense of "complications" you dread from women are still able to be found in some form, however truncated, in the experiences of tomboyish women.
Because many of those "complications" are rooted deep in the incontrovertible reality of their being women, and many also exist on account of the experience gap between men and women (so, also partly because of the incontrovertible reality of men being men) that prevents men from understanding or sympathizing on those matters.
It's impossible to meaningfully quantify these qualities, whether you consider them natural, metaphysical, or both.
...why would taking >1 hour to get ready for an outing be a feminine thing in the first place?
Well, we can grant that it is, for argument's sake-- my point applied, then, is that maybe tomboyish women get ready in 30-45 minutes. Less than a non-tomboyish woman, but perhaps more than would be comfortable for those waiting for her. Again, it's the fact that she's still a woman, and still bears femininity to a significant degree on account of being a woman.
The "no escape" part, specifically, is aimed at those men who would see in the tomboyish woman a promise of not having to deal with those aspects of the female experience that are inconvenient for men (understandably or otherwise).
That said, you're conflating matters-- each "complication" you can think of is downstream, in whichever way, from the femininity that women possess. "Taking >1 hour to get ready for an outing" isn't a quality-- it's downstream from multiple qualities, her femininity (defined biopsychosocially) being one of them.
Denying that there'll be complications (which you ascribe to femininity) at all is a denial of "a part of her person", because it's a denial of her inevitable femininity (from which these "complications" result, in part or in full).