SB $4.50
BB $20
Hero $15

SB was down to $2 and was just going all in on everything and I doubled him up by calling with KQ, he had A 5.
BB is calling everthing all the way down and typing loads in text when he sucks out on everyone. He started with abut $10 not long ago.

I get 10 10 and raise to $1.75 after intial raise of $0.50 from SB,which BB called.
SB goes all in as expected and BB flat calls for $4.50

I then raise all-in over the top.

Good or bad? Would you expect BB to call? Is he priced in?