Meaning is not carried by the words, it’s carried by your mind. We assume that we assign the same meanings, but that’s a big assumption.
These online conversations, composed of words and only words, are arguably 99% us just talking to ourselves. Maybe even 100%.
Get a glass of water and taste it. It tastes like that.
But how would I know if our experience of the taste of water is the same?
Because it’s water.
You’d have to settle for close enough here. You might even drink from the same glass. Beyond that … until we invent telepathy.