Are women-only bridge tournaments discriminatory?

I got some clarification on this matter. The ACBL abandoned Men’s Pairs events in response to a lawsuit. The plaintiffs weren’t objecting to sexism in the abstract, but for practical reasons: they were husband-wife professional-bridge pairs who could not maximize their income or qualification chances if forced to sit out during the Men’s/Women’s events.

I didn’t Google for disposition of the case, but plaintiffs were apparently happy to get rid of the Men’s events, leaving Women’s and Mixed intact.

Checking the schedule for the ACBL’s upcoming Spring Nationals, I see that Women’s Life Master Pairs Championship is played at the same time as an Open Pairs Championship, and Women’s Swiss Team Championship is concurrent with an Open Swiss Teams Championship.

There is a Mixed Pairs event at the Spring Nationals but its qualifying sessions are held the same day as Round Two of the Vanderbilt Knockout Teams event, one of the most prestigious championships on North America. BTW, I mentioned the Vanderbilt in a previous SDMB post: