Why do some some women use “gay” as an insult?

I notice both women and men use gay as insults but the difference is the same woman who says she support gays use gay as an insult, why is that? I noticed this recently when my friend who is very local about supporting gays, transgenders etc called some random guy she didn’t like gay. Which made me think for a while. This has to be internalized homophobia right? Because gay is often associated with weak, embarrassing, laughable etc.

Men are often insulted by questioning masculinity. “Gay” becomes a lazy proxy for “not a real man.”

That itself is rooted in misogyny and homophobia.