*rant* Losing patience with boyfriends dad (sons grandpa)

OK so we live in a house with my boyfriends dad (62), us (27) and our son (2). I never minded him at all, until I had my own kid. I just moved in 2 years ago and we've been together for 7 years. The reason we live together is because hes old and can't do a lot of things alone, so we pretty much live with him and help out around the house, which is fine and I'm grateful to be living here.

Some things he does are great, like he'll always buy my son berries, candy, toys, etc., and other things are just annoying. For example, if my son just happens to be throwing a tantrum, he'll come down the stairs and will be all like "is your mother beating you down there?". Which I've repeatedly told him not to do in case he repeats it at school. Yesterday he gave my son a lunchable and I always open the chocolate for him at the beginning, so and my son excitedly picked up the chocolate from the lunchable. His grandpa yanked the chocolate from his hand and kept saying "no" over and over. Then my son obviously was unhappy. He was all like "uh oh is he upset at me?" (Duh). Anyway, I was just like its fine I let him eat it with his food cause he usually eats everything anyway. And he was like oh. Then in order to gain something with him again he was all like "here let me fix this for you, your mother didn't do it property". He constantly tries to parent him like "dont do this" "get off of there youre going to get hurt" "dont touch that bug you're going to have an allergic reaction" (hes allergic to peanuts, not bugs). If the other grandkids are over he'll say my sons name and he'll say something like "hmmm, nope you're still short, sorry". Then I'd be like, well yeah hes the youngest one 🙄". He picks on all of them btw. Like the 4 year old likes his hair buzzed. When he comes over he'll be all like "hey skinhead".

Anything I say to him goes in one ear and out the other honestly. Im assuming it's because he's older and his memory is already bad. My boyfriend doesn't say anything because he was raised that way so I guess he thinks its normal. I dont know what to do. He's honestly hitting a nerve and I'm getting really annoyed. My son loves him but he is young and doesn't understand a lot of whats going on. Any advice is recommended. Thanks for reading this far! I will add i know he loves his grandkids will all his heart, he just isn't aware of the things he says.