[Wowfunhappy]

...did you not read the contents of your pasted message before hitting send?

I agree this is annoying but I don't think it quite rises to the level of "toxic".

[pdpht]

If you use a CLI IM application, like an IRC client, you're toasted. I've been bit by this. The real question is why are websites allowed to manipulate what I copy into my clipboard. Imagine if, instead of adding some spam to the text, they slightly changed what the text says.