Depends on how big your antenna is.
We find conclusive proof of advanced alien civilization on a nearby exoplanet; what do we tell them?
Something like truth social speaking to twitter back and forth, perhaps with a dash of religion and mansplaining thrown in for comic relief? That would end well. Show our best, make them like us.
“Roll up your windows and lock the doors when you drive past us!”
Just lob a few neutronium bombs our way. Please!
They could reasonably consider trying to show only our best as attempted trickery. And I doubt we could trick alien anthropologists for long.
We come in peace and mean you no harm is the first lie we tell everyone, why stop now?
Even if nearby I don’t think we will be able to communicate much more than peek-a- boo I see you within our lifetime. It would take hundreds of years to have a conversation and we don’t have that kind of attention span.
If they’re that advanced, they probably know about countless other advanced civilizations out there. Why would they care that much about one more?