I wouldn't call it 'black-hat'. While there is the aforementioned illegality (breaking in), it's a bit of a stretch to call it 'hurtful' as the only reaction was a bit of hurt pride. The stadium burst out laughing, so I wouldn't call it something that only benefitted the hackers either.

In all it wasn't a malicious act nor done for profit, so I believe that associating it with the type of hackers who do behave that way is incorrect.