I hate my grandpa a lot

IF this is the only reason to hate him, then m sorry to say you might be wrong, now come on he must be having his own frustrations and stuff, which he would be taking it out right there, hes your grandpa, he has nothing to do, he also would have his own problems, his aged and might be suffering from chronic frustration try to understand him more and let him go on cursing now come on if he finds happiness in these then let him do that, be busy with yourself why do you interfere with him hmm? And yeah if theres somewhat more than this then surely hate him!

I am sorry you have to go through this, your grand father should have a little more respect and dignity for himself. I guess he can't see himself as others see him from the way you describe his ways and action he needs a lot of improvement himself. You sound like a very nice person, so don't let him make you stoop to his level. Don't hate him pity him. He needs help.

That is sad. I'm sorry you're in that situation. Fortunately, it seems you have not taken on his values. All I can say is that hating people only makes the situation worse. It just spreads hate and anger. Try not get too mad at him. I'm sure he has some redeeming qualities, you just gotta look for them.