OP I have had the same issue and the most “boy coded” dance place I could find locally was this one in Takoma Park:
https://www.all10breaking.com/ I have a former colleague whose son enjoyed this studio up into the teen years. We never tried it because it would have been too much effort to get there around our other activities, though. I thought about just hiring an instructor and getting my son’s friends to sign up for a boys only class in a school gym but haven’t yet gotten organized enough to actually do it. If you do let me know!