See "Grandma's Kisses" and "Hooky"? This is how you handle an embarrassment plot! Yeah, spoiler alert, I like this episode. Let me tell you why.
Just like my introduction said, this episode handles embarrassment in its plot. And it does it far better than certain other contenders, that's for sure. And that is because of a couple things. First off, the actual embarrassment does not last very long. Yes, Kevin is trying to humiliate SpongeBob for most of the plot, but it only actually happens for less than a minute, and that tension is broken by King Jellyfish showing up. SpongeBob enjoys himself for the rest of the trials that are supposed to lead to his humiliation, which means it's actually enjoyable to watch. The second reason this episode does much better with the embarrassment aspect than other episodes is because the humiliation is fairly minor. It's not a whole restaurant laughing at SpongeBob, it's just a few members of a club. And it's also not people we were previously familiar with. So this works just fine for me, and I don't really get any secondhand embarrassment.
Now, to focus on other parts of this episode, "I'm Your Biggest Fanatic" is simply funny. Patrick's whole journey at the beginning and the end of the episode cracks me up every time, as does SpongeBob's antics when he spots Kevin. I also found the montage of Kevin repeatedly getting stung to be hilarious because of the immediate justice being served. The anchovies in this episode were a nice touch, being good hype men towards Kevin, and later turning on him once it turned out he was just a wuss.
In terms of the plot, I also like the plot of this episode. It makes perfect sense to me that being the geek he is, SpongeBob would have idols in jellyfishing. It also kind of expands the world of SpongeBob SquarePants a bit because now we know that jellyfishing is both a recreational activity and a serious (at least kind of) sport/hobby. Enough for popular figures in it to have a die-hard fanbase, at least.
I don't have all that much to say about this episode. Kevin is, of course, an a-hole, but that's the point of his character and he's entertaining and well-voiced. I really like the visuals in "I'm Your Biggest Fanatic", from both the visual jokes to the lovely Jellyfish Fields background. I have no problems with this episode whatsoever, and so it will be in my "Amazing" tier.
Episode Tier: Amazing
Episode Score: 9/10