Interesting, but we have 2 variables here. How do older men with only sons, and older childless men stack up? To what do you attribute the difference - maturity, or having a daughter?
Actually, it seems to be both age and having a daughter, compounded. Older men seem generally more agreeable/less-fratboy, but men with daughters seem to be actively conscious of the environment and actively try to be respectful, even if it's counter to the culture.
Of course, this is all just anecdotal, and my sample size is still small right now.
With lots of things involving discrimination, people tend to get a bit more tolerant when there's someone who they know who could be affected. e.g. families with a LGB member are a bit less anti-gay etc.
