A word of advice: if you're going to tweet at J.K. Rowling and Watch The Heirs Onlinequestion her right to tweet about political matters, you should probably be prepared for a fairly no-nonsense reply.

On Thursday, theHarry Potterauthor posted the following tweet about Brexit.

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Rowling is usually pretty vocal about politics on Twitter -- this was her second tweet about Brexit in two days, and she's previously made her thoughts about Donald Trump and his administration abundantly clear.

On this occasion, though, someone sent her the following angry reply that questioned her right to "spout politics".

Turns out it may have been a mistake.

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Ouch.