Dramatics, in this use, is behaviour that shows too much feeling — big sighs, tears, anger, a scene — when it feels overdone, tiring, or not quite sincere. If you are tired of someone’s dramatics, you think they are performing their feelings rather than simply having them. It is a critical word; the tone is informal to neutral, and a little sharp. Though actually the same spelling can also mean drama as a school subject or club (“She is in dramatics” = she does school plays), so you have to hear whether the speaker sounds fed up or just factual. The over-the-top meaning comes from dramatic plus the -ics ending, the same kind of pattern as hysterics: a type of behaviour named after the adjective.