I'm just worried that among progressives of the past, many open minded positions of today would have been 'opening your mind til your brain fell out'. Consider

I'm just worried that among progressives of the past, many open minded positions of today would have been 'opening your mind til your brain fell out'. Consider what people would've said a century ago if you brought up homosexuals marrying or transsexual acceptance. What today seems a strange to use as those concepts seemed a to progressives a century ago?