I wonder if this is a mainly US problem or an international one? While I could imagine some of the people I know would do this 'for harmless fun', it's only 1-2 idiots (out of all the people I talked to in my life), but those are jerks in real life too...
I'd love to say it's just 1 or 2 idiots but stories like these are so common that Ive come to the conclusion that there is a very real gender bias at play. Which makes me both sad from the perspective of equality and disappointed as a representative of the male species. :(