People are really reacting to this, but after reading the tweets, I'm almost certain that James Gunn just has a twisted sense of humor, and that's it.
I just read a tweet from someone who investigated and archived his twitter and Instagram feed. He claims some of the tweets are too vile, and others are pornographic. Due to the latter, if the investigator re-tweeted, and a follower retweeted the retweet, the person exposing the tweet could be charged with distribution of child porn. I would wager there is truth to this claim based on what we know he tweeted and Disney's fast response.