Holy sh!t now. Ghostbusters was not a B-movie. It's a big budget sci-fi/paranormal comedy, of course it's "attempting to be silly on purpose". I'm also gonna call bullsh!t on Ghostbusters being a parody of Lovecraft, Aykroyd and Ramis never wrote those movies with Lovecraft in mind. Hell, the original script for Ghostbusters had them in space going through a goddamn hell dimension, but they had to cut it back a whole bunch because it would have cost something like $300 million to make, and for a movie in the 80s, that was never gonna happen. Inspired by Lovecraft in some way? Perhaps, but not a parody at all.
Do you even know what "B-movie" means? It's a movie that has a dreadfully low budget and low production values, which then owe to mediocre actors and the common cheesy acting. Movies of this kind were shown after big budget, A-list movies, the ones people really wanted to see. B-list movies were something only dedicated moviegoers would bother with, and drew less of a crowd because of their low budgets.
Ghostbusters cost $30 million dollars to make and had a cast and crew full of extremely high profile talent. It is in no way a B-movie. It's not even campy! It was written as a comedy!
Do you even know what a parody is? It's taking a well-known style of something, and then exaggerating it to an incredible degree for humors sake, the same as satire. Movies like Naked Gun that parody spy and action movies, but not Ghostbusters. Ghostbusters isn't parodying anything, certainly not Lovecraft, it's just a comedy written by two guys who know comedy with a hook of "dudes who catch ghosts but are easily spooked".
Are we gonna get on the definitions of words again that you'll just ignore...?