B737 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 200; Flight Crew Total 20000; Flight Crew Type 6661
Situational Awareness; Communication Breakdown
Conflict Ground Conflict; Critical
Flight Crew Took Evasive Action
Airport; Environment - Non Weather Related
Sitting number 1; waiting for [the] Ground Controller to call us for a taxi clearance. We were set up and prepared for a XR taxi and take off. A RJ was at spot 1 and was given a taxi clearance to XR. We then got are clearance to XXL. The RJ started their taxi in front of us getting in line on to [the] taxiway behind three aircraft waiting for clearance to cross runway XL. We started our taxi but the RJ was blocking us from continuing on to [the taxiway]. We stopped. Another RJ was moving up and got a clearance to XXL and to follow us. The Ground Controller gave clearance for aircraft to cross XL; as the traffic started to move and the RJ moved up when they could. I cleared our right; the RJ had just stopped. We continued our taxi referencing the RJ and our left moving on to [the] taxiway and the other RJ on our right they had just stopped to our right. The Ground Controller then told the other RJ to our right to go NOW. Well; they did. We came to an abrupt stop. The other RJ aggressively pulled out in front us and cut the corner to [the] taxiway taxiing though the J lines to [the] gates. I could not get word in to the Ground Controller to ask what had happened. We continued to taxi when it was safe. As we taxied down [the] taxiway. I called 3 times to the Ground Controller; he responded; what do you want. I told him to pull the tapes and that what just happened was not safe. He responded he will look at them. We continued our taxi to XXL. At [the intersection] we had to stop for a widebody on [the] taxiway. We did receive a clearance from Ground Controller to give way to traffic on [the] taxiway. After the widebody had cleared [the intersection] we continued are taxi to XXL.
B737 First Officer reported that while taxiing; a regional jet cut in front causing us to stop abruptly.