lol sounds like my old job which I quit, man I was really mean to my boss come to think of it
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I could get pretty demonic when I'm pissed, luckily my co-worker stopped me before I punched a hole in his face.
my advice.... don't take no for an answer, once you let people get a free ride and they are A--holes they never get off.
we have an old saying (more like scripture XD)
if you are gracious and generous to a decent man you will own him, and if he is a wicked man he will rebel and spit in your face later.... well translation takes away most of it
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short version:
be weary of the evil of those you honored(or helped, or gave charity to...etc) ..... again some meaning lost in translation
IN SHORT.... get that vacation and tell him to MANAGE without you.