FWIW - if there have been any personal attacks IMO in the private TB forum, they have occurred more in the last year & in response to votes going on longer than perhaps they needed to. However, I don't think that TB member(s) expressing frustration with another TB member(s) for dragging things out is actually a personal attack vs. just expressing frustration. There IS a difference.
My first few years on TB, TB members pretty much stuck to the discuss the idea & not the person, even when TB members were divided (& in some times passionately divided!) on issues/motions. I would hazard a guess, that frustration on votes aside, that's pretty much still the case.
Cheers.