Dont confuse hazrat and hazraat. (none of them have any religious meanings)
In the joke its definitely “Hazraat” as fauji786 said … just like most of the announcements from pak masjid speakers start this way
"Hazraat aik zaroori ailaan suniye"
and the above bolded part from your post remind me of when Sajjad Ali (Pak singer) sang a punjabi song that had lyrics “Pyaar naseebaan naal milda Hazoor ay” and one of my friends was complaining that … how come Sajjad included Hazoor in his song he should have left religion aside … I burst out laughing and explained to him its just an urdu word which fit in that song and have nothing to do with what you are thinking. He could not understand me at that time.