There have been several takeoff tail scrapes in the RJ100, noticeably associated with upgrade training from aircraft with markedly different rotation characteristics e.g. ATR transition to RJ.
Less experienced pilots may rotate ‘enthusiastically’ or not consider a takeoff check attitude, instead they aim for the FD which is really only valid when airborne (V2+10, or V2 [or whatever you have when the engine fails]). The RJ is possibly unique in that you can generate a high pitch rate which is sufficient to lift the wheels off and then scrape the tail when airborne!