Suppose all of the above were true. Suppose he was a 14 year old just looking to make hooch. Is that good reason to dislike/hate him or even ridicule him? The only possibly sound reason is that he may be deceiving his parents, which might be good reason to dislike him, but even that is tenuous. It rests upon many unprovable assumptions. (1) Only kids make hooch (2) He lives in an area with a drinking age (3) His parents are in fact being deceived (I started homebrewing at 19. My parents knew, and didn't care). Reading the previous posts, I don't think any of those points can be proven beyond a reasonable doubt. The evidence is circumstantial at best.
Second, I find it questionable that even the previous argument is sound. Does deceiving parents necessarily justify hate? Let me create an analogy to illustrate this better. Suppose there's a nation, let's call it the Nation of Beala, where it's illegal for anyone under the age of 21 to make cookies. Further suppose that there's an enterprising young man, age 14, who really really likes cookies. One day, a friend of his excitidely approaches him and exclaims that he's gotten a hold of an illegal cookie recipe. If he were to go behind his parents' back, and produce these contraband cookies, would that be seriously immoral? Further suppose that the cookies are of low quality, because he couldn't get his hands on better cookie ingredients. Would he deserve ridicule and hate for it (or even just dislike)? My intuitions say no.
The only objection I can think of to this analogy is that the idea of a cookie law is ridiculous, and that it's not at all like a drinking age, but I challenge anyone to try to make a distinction between the two. They're both arbitrary restrictions on what sorts of (mostly) harmless substances you can put into your own body.
Other clearly unsound arguments would be: (1) Making hooch somehow demeans the art of homebrewing. (2) It's off topic, because this forum doesn't deal with this subject, and therefore he deserves to be ridiculed. These, to me, are clearly unsound, and I won't even bother to address them.