I think it is not needed. theymos didn't ask people not to talk about merit abuse or not to tag them. It's your choice.
theymos responded specifically in case of bones261, IMO.
As per the rules of trust (No mandatory rule almost), I can give positive/negative feedback in general terms and of course, the general terms include merit abusing. If a people can abuse merit system, s/he is not trustworthy in my eyes and there is no problem with tagging him/her. If you think, someone is abusing merit, why don't you tag him?