It's not patronizing. We have, e.g., men in nursing conferences (https://www.aamn.org/2019-annual-conference). I don't find that patronizing as a man. It makes sense for a field where men are a minority.

“Looks Like This Domain Isn't Connected To A Website Yet!“

Hm.

I don't find the concept of a women in tech conference inherently patronizing, but having attended several of them I wish they had more technical talks and less focus on fluffier topics. I swear half the talks at the Grace Hopper conference (which is about women in COMPUTING, not just tech) in NYC this year were about diversity and inclusion, which is a worthy goal but not something I find particularly interesting in a conference lecture. There were probably 1/3 tech talks, 1/3 diversity and inclusion and 1/3 business-related when it's supposed to be a conference about computing. It just felt it was feeding into the negative stereotypes about women being unsuited for technical roles or not caring about tech itself but just the more social aspects. I came for the cool tech talks!

An earlier partner of mine went to such a conference. “Women in computing.” There was a show of hands who wanted to be a programmer etc; basically none did except my partner. She left feeling more of an outsider.