Calling out, as I understand it, is a tactic of online shaming. We try not to shame anyone, although it does still happen unintentionally.

Oh that's not what I understand it to mean. It's more like highlighting or challenging.

See meaning 4.3 here:

https://en.wiktionary.org/wiki/call_out

Like someone close to Trump could call him out by saying to him that Meloni didn't beg for a photo with him.