I find that this unwanted competition is especially prevelent in people that have ILS and a small dick
One time someone pulled that shit with me while I was deadlifting. He assumed that I was doing single reps because it was heavy, meanwhile I was really just acclimating during my warmup. Needless to say he looked like a humpback whale around 275lbs and couldn't even hang onto 315, but by then I was about done my warmup