Tinder is "casual sex: the app". Sexism is a very real and very serious problem in the IT world. But Tinder is not the most boringly neutral tech company you can find, especially in this particular sense.

It's good to keep the special-ness of this case in mind. For instance, sexism usually doesn't get this bad. On the other hand, an atmosphere that isn't as hostile as this can still be, well, bad.