The fact that you already had a hate-on for her before this obviosly biases your response on this to the point of idiocy.
Look at it through her monitor (or smartphone, whatever):
1. She gets a tweet challenging her to race, clearly jokingly.
2. The tweet is from someone whose bio describes HIMSELF as a "Defensive Tackle for Tampa Bay Buccaneers"
She posted back, also clearly joking, implying the request was crazy and referencing his status as an athlete in a contact sport.
He humorously challenged her to a race, and she responded in kind. Any awkwardness around disability flowed from HIS decision to challenge her from a wheelchair (which was fairly clever in the irony - nice media grab by LeGrand). Only an utter moron or someone living with autism would see this as anything other than good-natured, since she clearly didn't know he was physically disabled. Of course, the only person with a real right to be offended, LEGRAND himself, is being gracious, while anonymous letsrun clowns are letting it ruin their morning wank.
Do you think Lolo Jones does a quick Google search on every 15-35 year-old dude who blows up her Twitter? that She has over 325,000 followers. Do you have any idea how many tweets and DMs she must get daily? Morons!