Quite a shame how people respond

[thesummerqueen]

that your ad hominem attack doesn't prove your case

Don't do it without making your case. Pretty simple. It has nothing to do with proof.

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Also, calling someone a twat doesn't automatically mean you're making a fallacy when speaking to them - simply that you insulted them. It depends on how you construct the thing and why.

I'd beg to differ on the loss of argument. Sometimes you have to call a spade a spade. The rest stands or falls on its own.