Every single business on the planet has a circumstance in which a single ill considered remark is cause for immediate dismissal. I can construct examples where nobody would expect the relevant parties not to be fired. eg calling the CEO a stupid [racially denigrating whatever]

So the argument you're really making is about whether what they did was sufficient to pass the bar for "should be immediately fired". Because it wasn't that bad? Because a little casual comic sexism never hurt anyone?

Um, I would rather work in a place where people are afraid of saying: "We don't need any bitches working here!"

Sure, but if your team lead says it, you're fired too.

If my team lead would say it, I don't want to work for them.

Well, then make sure you don't end up both in the same new company ;).

My point was to fire the offender, and not everyone else who might be involved. Innocent until proven guilty, you know.

For me, I wouldn't want to work for a company that fires with collateral damage.