Why should an offensive term be acceptable because people in RL use it.
If I called someone a stupid paki, would it then be ok for a character on Eastenders to use that expression?
The scriptwriters are professional writers, I would presume that their vocabulary is large enough to find alternative terms for having a tantrum:
Entry Word: tantrum
Function: noun
Text: an outburst or display of excited anger
Synonyms: blowup, explosion, fireworks, huff, scene
Related Words: eruption, flare-up, outburst, storm, uproar; agitation, delirium, distraction, frenzy, furor, furore, fury, hysteria, rage, rampage, uproar; upheaval; reaction, rise; dander, temper; pet, pouts, sulk(s)