When you don't like the way someone is speaking to you

Language for saying so without escalating the situation [premium post]

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I’ve heard from a number of premium subscribers that they’d like help finding pleasant yet assertive ways to convey to someone that the way they’re talking to them isn’t ok. Said one,

When I ask nicely, they don’t seem to take me seriously. When I try to be assertive about it, they get angry. I can’t seem to find middle ground here. Help!