what is the ruling on eating with the left hand? is it haram, or makruh? and is it true that the prophet(saws) hurt someone when they said they coudnt eat with their right hand?
It is against the Sunnah way to eat or drink with left hand. For the Shaytaan eats and drinks with left hand. Imam Muslim رحمه الله recorded in his Saheeh Muslim on the authority of Jabir Bin Abdulla that the Nabee of Allaah ﷺsaid, “Do not eat with your left hand, for the Shaytaan eats with his left hand”. (Saheeh Muslim, Kitabul Ashribah)
The Nabee of Allaah ﷺ never hurt someone when he said he could not eat with right hands, but once he cursed a person who refused to eat with his right hand because of pride. It is recorded by Imam Muslim رحمه الله in his Saheeh Muslim that a person was eating in the presence of the Nabee with his left hand. The Nabee asked him to eat with his right hand. The man replied, “I can not do that”. Thereupon the Nabee of Allaah said, “May you not be able do that”. It was pride that prevented him from doing it and he could not raise it up to his mouth. (Ibid)
Therefore, though it is not Haraam but against the Sunnah way and the way of Shaytaan to eat and drink with left hand and hence it Makrooh.