Unfortunately you're wrong. You obviously don't spend much time around women. My wife sends plenty of things back, women in the office send so much stuff back to
asos and M&S etc. Thankfully the credit card company agreed with me, as technically they own the bike, and they've gone back to the shop. Putting 'return within 14 days for refund' on the receipt (or contract of sale) and not abiding by it, puts the shop into legal difficulties.
It's all very well saying this and that about it being comfortable 'for you', but everyone is different. I made the mistake of buying a 29" Trek MTB, and it was proper heavy. I stuck with it though, but quickly realised it was suicide trying to do mtb trails, so it became a commuting bike. And eventually languished in the shed as a spare until i sold it for less than half of what i paid for it.