Seriously How do you handle these types of people without getting aggressive with them ?

I think if possible stay away from idiots like this,you don't need the stress,try to put yourself in better situations with better people and maybe your confidence will be better.You can't really do anything about these type of people because they are ignorant and will only bring you down and don't get yourself into trouble over them as they are not worth it.So try to avoid them or walk away if you don't like what they are saying or doing.