No it isn’t. At no point is rape the punchline here or even mentioned. You are making a leap on your own accord and then blaming the comedian for your personal thoughts.

The joke comes from the situation where white men typically live in a world where people do not have power over them. In prison, that changes. The joke is not “haha rape”. The joke is “The tension you are causing women constantly with your harassment you could compare to the tension in a prison where you are at the bottom of the totem pole.”

You are the one who decided to take it that extra step, add rape and then blame the comedian. You’d have to actively make an argument to try and convince someone that the punchline is rape which, just in doing it, simply strengthens the point that it isn’t.