It's one of those "chivalry" things that falls both into the "sexist" and "sweet/d'awww" categories. In its own context it was honorable and decent, and in modern times it's out of place and does have the unfortunate distinction of, in a sense, reinforcing negative stereotypes about women (that they "need protection," that they are weaker, that they are objects that can be taken or given away). That said, there are still people who find it to be a lovely tradition and don't feel at all insulted or objectified by it.
It's natural for people to think of their family in possessive terms, my child, my spouse. To be possessive and even territorial in this sense of ownership, almost at an animalistic level when children are concerned. I'm not certain that equates to truly viewing people as objects.
Yes, but why, then, are men/sons not
also given away?
I'm not saying it's barbaric. I am saying that yes, there's an element of sexism to it, when you get down to it. Les is hearing the word "sexist" about a practice he values and it's getting his hackles up.
It's also- when you get down to it- a sexist tradition to have men always pay for dinner. Does this mean men who pay for dinner are insulting and objectifying women, or even that they're sexist, themselves? No. But they
are following another one of those chivalrous traditions that treats men and women differently.