Sometimes people make assumptions that aren't true. We've all done it before and will probably do it again, but be careful to check out things regarding your personal safety. Chainmail was excellent armor in the middle ages when sword battles were the norm, but wearing it doesn't mean you're safe from everything. Chainmail will not protect you from the following things.
I hope you have a good, long 4th of July weekend. Please do us all the favor of not protecting yourself from fireworks with chainmail.