It is equally emotive to say, 'You are a man, therefore your opinion on this matters not.'If that were the argument then, yes, it would be worthless. That ain't it though.
The stridency and emotional violence of many male anti-abortionists is hypocritical in the extreme.
And as I said, it is equivalent to the position, 'If you are not black then you could never represent a black person.' It just doesn't logically apply. A man can understand and take a position on abortion, just as he can on almost any other topic in law attempting to dismiss their opinion solely because they have a different anatomy isn't logical argument at all.