Odd, the guy's argument is that he doesn't want the odd occasional parent (as if only a few parents would object to this stuff) impose their world views (as if 2000 years of christian morality and decency are some fringe ideology) be imposed on others, yet THAT IS EXACTLY WHAT THE LEFT REGULARLY DO TO OTHERS EVERY DAY! All they need is one person to object to a tee shirt, sign, slogan or logo, etc., and they are more than willing to defend the slightest minority view against the majority every day!
The very BASIS of leftwing ideology is that nothing flies so long as it offends even one person, so long as that one person is a leftist.
But let 99% of the people object to THEIR views, and it is DOA so long as it is conservative, christian, moral or decent common sense.