When I scream its usually because the ammonia hit me too hard
But I dont see an issue - its the lifter getting in the zone.
Maybe in a commercial gym - but you’re in a powerlifting meet. Why WOULDNT you be watching the guy about to do a big lift on a platform?
This says a lot about your mindset tho. Maybe focus more on your training and not worrying about what other lifters are doing as an “ego thing”