You may be laughing, but my neighbour will sell one of her kidneys for that
I live next door to a Spanish expat lady with knee replacements and 3 nails in one of the hips after she fell from a bath tub. I do not think that she will be laughing anytime soon at your groin comment. In fact she will gladly part with a portion of her lifetime savings just to get her legs on this.
The number of people who lose mobility because their joints cannot take the load by far exceeds the number of people who go fully disabled. From there on they can no longer exercise, this damages their heart, they gain weight and it all ends up in one horrifying downward spiral. Mobility tools like scooters and zimmer frames are utterly useless here because they cannot help people like that move around the house (especially a UK one which has the bedrooms on the second floor).
While I generally appload the el-Reg attitude including the famous "what does this sign mean" contest in this particular case this one has probably went into the realm of " mauvais ton".