Is it normal to hate my grandpa?

Ya it's normal to hate people who make your life hell.

He sounds about as lovable as cancer. Normal!

One more thing I wanted to add, Your grandfather might even start faking heart-attacks. My great grandmother was not above this little trick and guilt trip. There are obvious signs and symptoms of a heart attack. I suggest you look them up and familiarize yourself with them. So when he pulls "a fake heart attack" you will know the difference. (Don't tell him what symptoms he doesn't have though.) The chicanery will be more transparent.

My great grandmother often pulled her fake heart attacks after not getting her way about something.
Ignoring it works best, but if you cannot resist it, you can throw out reverse psychology and say "Oh well...I guess you really are going...Too bad so sad."
I have a sarcastic streak a mile-wide though.

Don't do it if you think he is having heart trouble for real though. You will learn to spot the symptoms.

I'd say confront him.
Is he normal? Yeah, probably.
I had a cantankerous grouchy old great grandmother whose favorite pastime was b*tching 90-to-nothing about everything. She was demanding, rude, abusive denigrating and condescending about everything. When she was a hypocrite we pointed it out. I got to a point where I had reached my fill and would turn around and shoot it all right back at her. Only once did she dare say I was fat. She was 300 lbs (How the world anyone could live to be 95 and be over 300 lbs according to most modern doctors it is a miracle.) She made the mistake of calling me fat and I blew my top at her. I think I said "Try checking the mirror you hateful old fat cow!" It shut her up. She never said it again. But I didn't have to live with her that much.
If you have to live with your grandfather, then you will have hell dealing with him if you stand up to him. My great grandmother was secretly physically abusive. It did not come up until one time my mother reprimanded her about something and she raised her walker over her head to strike my mother, only putting it down an instant after I rounded the corner in the hallway and caught her. Your grandmother is probably abused and quietly suffers it.
If he gets on your case you might say "Oh will you just be quiet you old codger?" It might shut him up; it might not.
You don't have to put up with that crap and niether does your grandmother.
But I think it does happen. It is even spoofed in movies (Aunt Edna from National Lampoon's Summer Vacation.)

It is okay to hate being around him, but don't hate him, as hard as it is, and I understand, don't hate him. Love your grandmother.

He has got away with treating your grandma like shit for many years and now thinks he will treat you the same way.

If you're forced to live there - nod and smile, and ignore the old duffer! He won't change so let him rant and rave - stick in earplugs!

Yeah give your motherfucking grandpa a heart attack.

My Grandpa was stern. Growing up, I was compared to my cousins and I never meaured up. I felt he hated me. In my 40's I kinda understand why he was so harsh to us. He elso endured. It was a hard life for him and I was/is a slacker. I appreciate all that he prepaed and gave to us, his heirs. i am proud to bear his name. I am also ashamed that I turned out terrible in comparison to him or my own dd..... I apologozed to him at his grave. Nevertheless, I still feel hurt when I recall the terrible words I heard from his mouth....

Lmmfao!!!!!

Aahh he probably just wanted to see you around the place , but does not know how to show his feelings or express himself, and maybe when he was your age he had to be up really early...Why dont you ask him about his life when he was your age and how he felt and what he did and what his folks were like...You might learn a lot of interesting things that explain why he is like he is.