I dislike my boyfriend's mom

Before you judge me, hear me out. My boyfriends mom annoys me so much. 
#1. She is just very loud and she still baby talks to my boyfriend who is 20 years old. She literally speaks to him like he's 4 months old. The baby talk is ridiculous to a point where I just wanna cut off my ears.
#2. She can also be VERY RUDE and INAPPROPRIATE!!!! She sometimes likes to touch my butt and legs "just playing around" but it's just so awkard and kinda disturbing.
#3. She's always, ALWAYS trying to act like a jealous little child when he holds my hand or kisses my check.
I've put up with this for SO long and obviously can't do anything about it lol but I just want to know if anyone else dislikes their boyfriends mother? Or is it just me? Because I've never been around somebody like her lol.