We always take our own food on Ryanair because we get what we want and it's cheaper. The cabin crew have never mentioned a thing about it. There seems to be some sort of conspiracy to repeat this lie about food being prohibited until it becomes a 'fact'.
The only time we've seen any reaction was when some Corsican rugby supporters started passing litre bottles of pastis around. That was solved quickly and amicably by the confiscation of the bottles until we arrived a Stansted.