That's fine. If you were in that classroom, then you could say to the kid something like "Hey, you know I don't think it's cool that you're handing out no-homo chocolates", and we could go from there.
The fact that none of the students did that indicates to me that no one was offended. The other conclusion is that we've all become so desensitized to casual homophobia that no one noticed that they...ought to be offended?
Or that no one wanted to start shit with some dude handing out chocolates. Is that really hard to believe?