Actually, the orginal sentence I tried to verify was the following, but by mistake, I changed "understand" to "hate". Anyway, both examples are meaningful to check out, I guess. In the following, does the second refer to general laziness or my laziness or is it ambiguous? I think "understand" can result in a different interpretation from "hate"
I can't understand his being lazy
=> I can't understand being lazy (general or me)