"Bicyclist arrested after allegedly threatening woman at Braintree Mall"
I would have been content with either "Bicyclist arrested after allegedly threatening Driver at ..."
or "Man arrested after allegedly threatening woman at.."
Sounds like the guy was a bit of a nutcase (why was he carrying a big knife to begin with?) but either the means of transportation was relevant (did she cut him off and was there was reckless driving involved) or it's not (and he was just unbalanced in a way unrelated to his mode of transport. Having it in the headline just serves to signify that bicyclists are "other", different, theatening and just not like "us".
I didn't even look at the comments, I knew they would be full of vitriol, and I don't need that this early in the morning. In this case, the headline writer might be responsible for some of the hate.
Fair and balanced...