That is very true. It does seem to me there's a subtle "personality shift" among some people when they speak a separate language.
Sometimes you see people become warmer and more affectionate because either they know how to be that way in their native language or it's more common in their culture (e.g. seeing a native Spanish speaker speak Spanish after knowing them only speak English).
There was also an interesting study about asking people solve trolley problems in their second language vs their first. Whe. Solving in their second language, the solution tended to be more utilitarian and logical.
Sometimes you see people become warmer and more affectionate because either they know how to be that way in their native language or it's more common in their culture (e.g. seeing a native Spanish speaker speak Spanish after knowing them only speak English).
There was also an interesting study about asking people solve trolley problems in their second language vs their first. Whe. Solving in their second language, the solution tended to be more utilitarian and logical.