I am unsure if you are using the word "contempt" in a strange manner or if your definition of "contempt" contains something more than what Merriam Webster includes:I'm surprised by the level of contempt that some here are showing for a disabled person. Seriously.
Definition of CONTEMPT
a : the act of despising : the state of mind of one who despises : disdain
b : lack of respect or reverence for something
: the state of being despised
: willful disobedience to or open disrespect of a court, judge, or legislative body <contempt of court>
From the context of what you have been writing, it seems the word you want to use is "underestimate." No one here has shown any contempt, despising, irreverence, disrespect, and so on and so forth to those who are handicapped. We're showing "contempt" for an officer who was trapped in a corner by a person who physically cannot both swing a pen as a threat while still cornering a person. If he's moving the wheelchair to keep the officer "cornered," then he physically cannot also be waving the pen around as a threat. If he's waving the pen around as a threat, then he's not moving the wheelchair. The only possibility for this person to be both a threat with the pen and at the same time maintaining his "cornering" of this officer is if his wheelchair could be steered using some other appendage, which, as of now, is unknown.
So, no, no one is showing any contempt for the disabled person at issue. No one is showing any contempt to disabled people in general. I've lived and dealt with disabled people all my life, so it's incredibly presumptuous and pretty much par for the course for you to pretend that you somehow know better than others.