Sure it is.
> It's not self-evident that pointing out hypocrisy isn't a valid refutation
If I say drinking tons of sugary soda every day is bad for you, when I drink nothing but myself, how would my hypocrisy have a bearing on the effects of drinking soda? Yes, it's self-evident. It shouldn't even need saying because nobody should be so dishonest to even attempt it as an argument. It's the kind of dumb shit people say about other people, never to them.