Is it okay for my boyfriend to say me rip jokingly?

Its been abut 7 days of me suffering from a dry cough and i told my boyfriend that i feel like dying from a cough cause its not getting less. In a response he said RIP and smiled. I really found this bad coz he says mean things often. Is it acceptable? Am i over reacting?

Is it okay for my boyfriend to say me rip jokingly?
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