It is not a strawman- it is a valid illustration of the absurdity of your belief that no objection to gay marriage is reasonable or valid if the objector cannot describe personal damage to himself that would occur in the face of gay marriage.
What are the damages? Both personal and societal? There simply aren't any rational objections. If you have one, now's the time to express it.
Neither individual heterosexual marriages would fail, nor society fall apart once same sex marriage equality becomes a reality.
Why do you insist that, in order for an argument in favor of restricting a particular group from being married, one has to have valid concerns about being damaged?
One valid reason for favoring the current state of marraige is that a couple hundred years of family law precedent is based upon it, and where family law is concerned, stability is a rather nice thing to have. And to think that introducing a new marital relationship into family law, a relationship in which there can only be a single biological parent, will not shake things up a bit is naive. If you are unable to conceive of how that just might be the case, I can help with that. Now, I won't be personally affected by that, nor would I if my neighbor were permitted to marry a donkey. Which is totally irrelevant.
You are so convinced that you, and consequentially all others who agree with on this issue, have cornered the market on decency that anyone who disagrees with you must be a small-minded homophobic bigot. ANd that seems to be a rather small-minded way to think.
I have yet to give any indication whether I am for or against same-sex marriage. And I do know this: the nearly half of the country that opposes it is not comprised of the small-minded bigots you want them to be.