At the foundation of the whole thing is a statement that she was unworthy or undeserving of her bike, not a true triathlete like yourself who doesn't need those fancy things to be faster than she is. It's fundamentally belittling.

Your post was followed by several more, stating that

"has more money than sense,"

"I would rather "be the part" than "look the part".

"She may have got the bike before she realized how hard it is."

None of us should really judge what kind of bike anyone else is deserving of or can "back up." Whether you're consciously aware of it or not it's a way of asserting superiority over another person who has something you don't and likely covet to some degree.

It's not even a personal dig on you or anything--it's an attitude that's rampant in any sport that requires equipment of any kind, and has become annoyingly prevalent on BF.