When visiting a household, Sim will not give the host Sims the "Rude Guest" moodlet when doing the following - sleeping in the bed, eating from the fridge, bathing or showering, or doing a mean social interaction with the host Sim.
Inappropriate Sims will have the option to talk about other Sims that are standing nearby.
Inappropriate Sims can rummage through other Sims' garbage.
Inappropriate Sims can "Knock Over" neighbors' garbage cans.
Sim has the "Sponge Bath" option with sinks which will enable them to bathe anywhere where there is a sink (and generally offend everybody in the room for being naked)
Inappropriate Sims can "Talk About Other" if a third party is present. This includes talking about the Sim's face, job, or family.
Inappropriate Sims can kiss any Sims: even their own enemies or strangers. Usually the Sim will be rejected unless they have a high relationship with the other Sim or the other Sim has the flirty trait.
Inappropriate Sims can make inappropriate forum posts on the computer.