Men are absolutely entitled to their opinions. However, said opinions may not be welcome if they voice them because, well, for beginners, those opinions may be misogynist in nature (as that person's obviously are). For another, men see sexism from a position of power, which puts them in a very different position from women who are experiencing sexism -- that is to say, men are unwelcome both because they have power and privilege here, and because they are not the ones experiencing sexism, and having someone talk down to you about what ~real equality~ is, what constitutes sexism, and how feminists should behave when they have never experienced real sexism, when they have no idea what it's like to be a woman in this society/culture? It gets old fast.

Men can have their opinions, but they don't get the right to make their opinions more important than those of the women who actually live with and experience sexism every day of their lives. And they sure as hell do not get to dictate feminism to women.