I am having the same issue.
(https://wordpress.org/support/topic/feature-request-responsive-design?replies=1)
Here’s what I posted (edited):
Would be so great if bb style pack would support Responsive Design. When I browse my Forums on iPhone (portrait and landscape), the headers: ForumTopicsPostsFreshness (they all overlap horizontaly) making these unreadable and useless.
I have the feeling that using TABLES instead of DIVs and or UL, LI, in this case, would be very helpfull.
Using TABLES (th, tr, td) could play nice with a plugin like FooTables (Responsive Tables).
Kind Regards,