[PakistaniDenzel]

What happens if you respond to something like this with a simple "Fuck off"?

[LBJsPNS]

I refer you to the reply given in Arkell v. Pressdram.

https://prunescape.fandom.com/wiki/The_Reply_Given_in_Arkell...

[jaclaz]

Personally I find that the best reply ever was this one:

https://lettersofnote.com/2011/02/14/regarding-your-stupid-c...

letters of note has also the Arkell vs. Pressdram letter:

https://lettersofnote.com/2013/08/07/arkell-v-pressdram/

though there it says that there never was a proper legal case on the matter.

[kadoban]

They fuck off, or they sue you. And/or they keep being generally annoying. Hard to say which they're likely to do.