In the Bay Area city where I live, during rush hour I can regularly count 60+ Teslas just walking around my block. I haven't heard of one such incident.
i have been an electric vehicle enthusiast and evangelist for more than a decade, well before anyone knew tesla or elon. i know everything about electric cars. i can state with total confidence that the hottest ambient temperature that a tesla might encounter would have precisely zero chance of causing the battery to overheat, let alone overheat to the point of creating thermal runaway.
I'd just ignore him. He doesn't know what he's talking about