Spam is unsolicited. You don't get to message someone and cry "spam" when he replies.
It sounds like you're saying that even if the messages were relevant, such as "you tagged the wrong account", that would be unsolicited?
A single burst of tweets is very solidly solicited when you tag someone, even if it was by mistake.
> Don't get emotionally invested in this.
What in the world do you mean by "emotionally invested"? That reads like a weird way of being unwarrantedly dismissive.
As for the response, it would be unsolicited by the fact the original tweeter did not ask/want a response from the Meme-ster. They tagged the wrong account.
Take this example:
John says to the person he thinks is Brad: I can't believe the weather today!
Emily says to John: What the fuck did you just fucking say about me, you little bitch? I'll have you know I graduated top of my class in the Navy Seals.... etc....
John's reaction to Emily: WTF who the hell is this? Why is she saying these things to me?
Now imagine this happens to be a common mistake that multiple make and Emily responds in this way every time...
That's an example of a reply that is "unsolicited" and "also irrelevant", by your criteria.
I'm not trying to defend that combo here. You said such a screed is "also irrelevant", right?
That means even if a reply wasn't irrelevant, even if it was a useful response, it would still be unsolicited. Right?
Is that what you intended to say? Am I misreading something?
If you send someone an invite to a discussion, they're invited, whether you meant to or not. At least long enough to send a single reply (which may be multiple tweets).
Whether their response is a polite "you tagged the wrong person" or some awful screed does not change whether a solicitation happened. Especially because tagging someone is not a request for any specific sort of reply.
Relatedly, if someone is eavesdropping in public and steps into a conversation to make the most wonderful helpful and loved comment in the world, doing that was still unsolicited.
Also tagging does not necessarily request a reply at all.
This is silly and will go in circles so I will finish by just saying.. What the fuck did you just fucking say about me, you little bitch? ....
And that's what twitter is, brief conversations.