Yes, IABU.
For those who don't understand fluctuating health conditions, here's disability campaigner Kaliya Franklin giving an articulate and energetic speech at the Hardest Hit Campaign (second video).
And the third video on that page is Kaliya the day after. So exhausted her speech is slurred and she struggles to form sentences.
So when you read yet another news story - and they're all the rage - about someone on disability benefits being seen walking or swimming or going out with friends, do remember the full picture may be really rather different.