Queerbaiting is when people in the media (usually television/movies) add homoerotic tension between two characters to attract more liberal and queer viewers with the indication of them not ever getting together for real in the show/book/movie.

The relationship between Dean Winchester and Castiel is a prime example of queerbaiting and we need to change this. Either establish a canon relationship between them or stop hinting at the sexual tension altogether. Queerbaiting is offensive and can cause fans to walk away and ratings to plummet. Personally, I would hate to see the show end because ratings have dropped as the rest of the plot is wonderful.