Do we think Cap spoke or at least understood Polari?

I did a bit of a deep dive on it after seeing a love is blind couple call their kid J3hn Polaris Pax (I'm not kidding. The J3hn - ie John cubed - cos of 3 family members called John) and it made me think of Polari and how certain common words were get it from it.

Like butch, camp, dishy, drag (in the clothes sense) naff (the meaning has changed - apparently used to mean straight or not available for ********) all came from there.

Do you think Cap would have spoken it? I do think so but given his stiff upper lip it's kind of hard to imagine him actually speaking Polari