Years ago, I was a bouncer in a rough bar.
Still does not relate to the OP. Maybe you want to brag on how tough you are, but the situation the OP described warranted caution. Ridiculing a 17 yr old for being cautious is uncalled for. Being tough does not mean you should be careless. And being cautious does not mean you are weak. The OP did the right thing not to open the door.
Please try to stay on topic of the OP and not prattle on about your bouncer days. The OP was not at a bar and being paid to handle troublemakers..