Reggaeton is a new style of music, and many people are scared of things that are new. Because of this fear, many of them will hate Reggaeton and say "oh Gasolina sucks, that music is no good. It all sounds the same."
Step 1: Resist the urge to punch them in the face for disrespecting the music.
Step 2: Take a deep breath.
Now, here is where it can go in many directions. You have to ask yourself this question: Would reggaeton be cooler if this idiot liked it?
Step 4: Make them the hottest of mixes.
Step 4: Say "yeah, I guess you're right. Are you still going to that Ozomatli concert? Awesome. Politics!"
But always, above all else remember that nobody hates on celery. It's boring and has no flavor. People hate on cilantro, it has a spice that not everyone can handle. So prepare yourself for some haters and be thankful that they aren't diluting reggaeton to the point where we get a Puerto Rican version of the Black Eyed Peas.