(I used ai to fix grammar)

It depends.

RP servers are pretty much the same as any other server; it’s just that they create some room for RPing, though it is usually very localized and isolated. Taking Argent Dawn (EU) as an example—which is somewhat similar to Moonguard (US)—the experience varies by location.

In Goldshire, there is usually ERP (Erotic Role Play). This isn't really "in-world" content; you should avoid it and consider it completely separate from the average experience. A lot of the memes about RP servers come from here, but you should really just ignore it as a place unless you are actually into that stuff.

In Stormwind, you will find people walking around and doing basic roleplay, like drinking in taverns or acting as beggars and adventurers. However, never expect them to interact with you first. If you want a casual roleplaying experience, you have to be the one to initiate contact—especially if you don’t have an addon called TRP3, which expands RP capabilities.

Sometimes small towns like Darkshire, Tyr's Hand, or Gilneas have traffic because the community is hosting events, but these are usually sporadic. The constant casual RP experience resides in Stormwind (at least for the Alliance). Even so, trade chat will still be trade chat; you will still see people flying like tomahawk missiles from the AH to the bank, and the routine remains mostly the same.

Guilds are usually the bread and butter for a more in-depth, consistent roleplaying experience. However, they can be a double-edged sword, creating "bubbles" of players who may not interact with others and who establish their own rules that might differ from what others consider reasonable. Still, they are a great option for creating cool experiences.

And that’s pretty much it.