Is "Revenge of the Nerds" (1984) a symptom of many women avoiding tech or is it one of the causes? The characters were nerdy, into tech, and generally despised by their peers (most notably women and athletes). The only girls who would associate with them were Omega Mu, who were a lot like the Tri-Lams. I don't think anyone would want to be a Tri-Lam or an Omega Mu in real life[1] (they are, after all, comically nerdy). I don't find it impossible that a generation of women thought "You know, I'd rather have an Alpha Beta, not a Tri-Lam. How do I avoid getting a Tri-Lam? Don't be an Omega Mu."
I don't think it's possible to know one way or the other. It's much more likely that RotN and things like it caused or were caused by deeply rooted stigmas against tech that made women shy away from it before even getting to the point of being exposed to 'frat-like' conditions in the workplace.