He is worried that he will get a negative reaction from the leaders. I have to say, that going by my own toddler group (church run, with a very slight Christian bias) he would certainly get a few odd looks, and possibly some nasty comments behind his back if people found out that he was gay.
I know there are going to be people who say, "How will people know?" but there is no way you could meet my friend and not realise that he's gay!