"Slursagi"

I've never understood why people call isagi "slursagi" or a "crashout". Everytime he's been mad at someone else on the field it's been completely justified. Sometimes in my opinion he doesn't go far enough. An he only said one slur in certain translations of the manga. So I just can't understand people who see isagi as this evil demonic force that goes around like a maniac insulting people for even the slightest things. I saw a tiktok where barou wouldn't pass to Isagi in the u-20 match and isagi called him an idiot and got mad. But isn't that just standard soccer/sport stuff? Nobody likes a ball hogger and if you do it in real life you should expect some unsavory words to come your way. Especially if your bad. The only time when I think he went to far was when he was yelling at kaiser that one time and then picked him up by his shirt.