I think it’s more charitable to read it as “it’s not a good enough answer” — you have the time, you’ve just chosen not to spend it here. Perhaps you have a good

I think it’s more charitable to read it as “it’s not a good enough answer” — you have the time, you’ve just chosen not to spend it here. Perhaps you have a good reason for it, and perhaps you don’t, but if you default to “who has the time for such things” you’re not being honest about it (to yourself, or to your questioner). It’s also only once you move on past that first nonsense answer that I can make my case: it’s worth spending your time on subject X, for reasons… But if we never get there, you’ve just brushed off the person unfairly.