It strikes me as utterly tragic that we have got ourselves so brainwashed with this political incorrectness madness that we are conditioned, pavlov like, to use words like "discriminate" when discussing a matter of basic common sense and/or legal requirement (conditions of carriage).
No one has been "discriminated against" here if the person wasn't complying (voluntarily or involuntarily, it clearly matters not) with Easyjet's regs. It's a matter of safety and rules, that's all. The Captain can't possibly fall foul of any "equality" laws - if the Ops Manual says he can't do something he can't do it, plain and simple.
Is this person "discriminated against" by not being allowed to drive a car, is a 9 yr old "discriminated against" by not being able to fly alone? What a preposterous idea!
Let's stop this silly self-indulgent habit of wailing into our hands whenever someone, for good sound common sense reasons can't do something most others can. Different abilities allow/disallow some activities in some people, that's just life. People are generally only prevented from doing things others find ordinary for good reasons, as here. Even if they are prevented from doing so it is never done to "discriminate" - that word when used in the emotive sense as here means the wilful and unfair selection of a person in order to disadvantage them. It is clear that this is an utterly inappropriate expression to use in a case like this.