My baby hates his grandma?

My LO is my mom's first grandbaby and she's obsessed with him, has been since I told her I was even pregnant. But I'm pretty sure he hates her... and he doesn't dislike anyone!! I kinda get it but kinda don't. She can be a bit intense, while myself and my husband and his childcare providers are all mellow people. She's constantly in his face and when he cries she freaks out...so he cries the entire time he's around her. I feel bad, he's a super happy baby and doesn't act like this for anyone else. He just cries whenever she is here. Anyone else dealing with something similar or have ant advice?