Depends on the plastic, you can safely heat most polypropylene and polyethylene based plastics. If it’s putting off noxious fumes then it probably has urethane, styrene, or vinyl in it.
The worst plastic to overheat that I’ve worked with is kydex. Even though it’s most common application is as a thermoplastic, if you over heat it the stuff off gasses hydrogen chloride.
We also white wash Spartan history pretty dramatically. Yes, Spartan women who were citizens were better off than their Athenian counterparts. However, that’s not saying much when you consider spartan citizens were a fraction of the population of Sparta.
The vast majority of women in Sparta were helots, and were subject to chattel slavery. I don’t think you can claim that Spartans cared about gender equality when they had an entire social class made up of the bastards produced by raping their slaves.