Of course both men and women can be toxic. The point of toxic masculinity as a term is to draw attention to the fact that there's a certain brand of toxicity that has much more harmful outcomes in male-dominated spaces, for a variety of social and cultural reasons. It tends to be a rather controversial term mostly because it gets conflated with the idea that masculinity itself is toxic (which is not what it's supposed to mean).

The discussion should be about the magnitude of the problem, not hand-waving it away because women do it too but in different ways. The "different ways" is kind of the whole point of the argument.

Also, that's a lot of extrapolation you did simply from a username in a screenshot. Would you describe any of their actual words in the post as misandrist?