Being a macho man, I don't like losing at games, especially when playing against women. (That is a general statement.)
When I am playing in my basketball league I really don't like losing games. (I have some specific games in mind.)
Now, you might be able to get away with "losing games" in the first sentence, but you couldn't get away with "losing at games" in the second.
Or so it seems to me.
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