I've never really faced that problem, but you can't blame a show for the fanbase. Besides, true fans know what the influences are because they were stated by the creator. Jake is supposedly based on Bill Murray's character in Meatballs, and that's straight from the horse's mouth.ADVENTURE TIME, not necessarily for the show itself, but its fanbase, which is mostly uneducated kids who automatically think every single fricken animated movie or series that came before it that feature two characters (particularly a human and animal companionship) going on adventures is, "Where ADVENTURE TIME came from." Seriously. Somehow, Rocky and Bullwinkle, TWICE UPON A TIME, Wallace and Gromit, H.R. PUFNSTUF, Tintin, and even Tom Terrific are all, "Where ADVENTURE TIME came from."
HOWEVER, on that note, I'll do you one worse.
My Little Pony: Friendship is Magic. Not for the show, but BOTH the rabid fanbase and the rabid detractors. They're both equally obnoxious and toxic. One side pushes everyone on the show and obsesses about the characters, the other side thinks that all the fans are pedos, or furries, or something that's essentially pulling fandom Godwin's Law, like it's the only series ever to inspire toon fetish porn...Like Rescue Rangers (Gadget), Heathcliff (Cleo), and Sonic the Hedgehog (everyone but Eggman) never existed. I'd say the detractors are just a bit more annoying, not letting people like the darn thing alone like adults.
Meanwhile, it scares off people like me who will watch virtually anything and kinda dig the show in a "spot the reference" way, but not watching it on a regular basis, watching it over a favorite show, or buying the toys, or anything like that. You're either a Brony or not, and there's no room for "heh, this show is actually pretty cool in a girls cartoons usually suck, they really made this so parents won't bash their heads for a half hour, I vastly prefer Transformers Prime anyway."