It's also less efficient for anyone who's listening to you. Gender-specific pronouns help ensure you're talking about the same person. Personally though, I find myself saying "that's what they said" (or similar, in a non-joke-related context) pretty often. Usually past-tense, for some reason. * shrug * to each their own.
I do boggle that "they" isn't technically acceptable for cases where gender isn't known, though. "He/she" seems like insanity, both in writing and in speaking, when "they" sits there waiting to be used. It's extremely rare that context isn't sufficient to determine if it's plural or not. Heck, Japanese essentially does without plurals entirely, and that's a functioning language.
I do boggle that "they" isn't technically acceptable for cases where gender isn't known, though. "He/she" seems like insanity, both in writing and in speaking, when "they" sits there waiting to be used. It's extremely rare that context isn't sufficient to determine if it's plural or not. Heck, Japanese essentially does without plurals entirely, and that's a functioning language.