Ok.

Let me explain how bars work.

They are generally fairly small and crowded.

There are often a lot of people having conversations with a lot of other people.

You can often hear some, or most of these, depending on where you are sitting.

Overhearing other peoples private conversations, that they are having in a public space, often loudly...

... That is not eavesdropping.

That is existing, in a bar.

Framing this as eavesdropping is absurd.

Eavesdropping, quite literally, derives from the concept of pressing your ear up against a window to a home or bedroom, from outside of it.

The 'eave' is basically the part of a roof or window design that hangs over it, kinda like an awning.

So, you hang onto or crouch down on the eave of the window, listen to the private conversation, and then drop down from it once you've heard enough.

Yeah, that's creepy spying shit.

You have a reasonable expectation of privacy in a private home.

You do not have this in a bar, or pub.

Pub being a shortening of roughly 'public house', a place where people are meant to gather, mingle, and interact.

Do you talk to yourself often?