YANBU @upsideup
I can't believe some of the OTT and histrionic reactions on here. I can only think you hit a raw nerve with some posters as they feel guilty or bad that their kids cannot ride a bike. Maybe they didn't have time to teach them, or the kids simply couldn't do it, or they just couldn't be bothered/didn't have the patience.
Whatever the reason, the snide remarks on here - aimed at you - are totally unnecessary.
I am also surprised when a child cannot ride a bike, as it does seem like a very basic skill, and a rite of passage. Me and my DH had a lot of fun teaching our kids to ride a bike. Comments like 'it's too dangerous' and 'not everyone can afford a bike' are feeble excuses IMO. You can get a young child's bike brand new for as little as £60-70. (Or second hand off facebook or out of the local papers for £25.)
Some people who claim they cannot afford a bike for their child, will spend frivolously on unnecessary items that they could do without (like contract phones and cigarettes.) I have seen it happen.
We were all taught as kids when I was growing up (late 70's,) does no-one remember the cycle proficiency test?! Everyone did it, so I am surprised when I meet an adult who cannot ride a bike.
I am also surprised when children cannot swim, but apparently 1 in 3 can't. Should be compulsory in schools to teach kids to swim....
As @catinapoolofsunshine said, cycling is a form of transport. I used to cycle to work (3 miles via back-lanes and a cycle route,) and it took me 20 minutes. (15 minutes back as it was more downhill back.) The same trip on the bus took 45 minutes, as it went all through the hamlets and housing estates etc. And that doesn't include the walk to the bus stop, and the 5-6 minute wait for the bus. So you could call it an hour!
Like @kursk, I am also shocked at the amount of people who cannot read maps! (Especially under 30s!)
I don't think people need to feel ashamed or defensive, (if they cannot ride a bike, or swim,) but then other people are entitled to think it's a bit odd that some people cannot do something that they deem so simple, and a basic life skill...
I am also surprised when I meet an adult over 30 who cannot drive, especially if it's a man. I don't care if that sounds sexist; it's how I feel.