One technique I've seen others on /mlp/ use which pisses off these obvious manbabies:
They post 'Yes, I have dirty thots about this character'.
They either fuck off, or try to explain the 'Joke': which only flies over their own heads.
Some are reduced to screeching. There may be Hippogriffs in this 8th series of "MLP:FiM": made canon since the film, but no frogs, y'see.