Not sure I agree. I've flown with several and we have a growing number on our field. It feels much closer to the "forked tail doctor killer" days of Bonanzas: the plane seems to attract intelligent, rich, high-achiever individuals who don't necessarily have the time to become/stay proficient. And they tend to have a lot of self-confidence. All generalizations/stereotypes but I do think there's truth to it, to a meaningful degree.
There are probably jackasses among pilots of just about every type of flying machine but they do seem over-represented in the Cirrus group. Around here, if the pattern is boogered up it sure seems a Cirrus is involved out of proportion to the number of them around. And, frankly, some seem like they want to be jerks just to be jerks: I was #2 behind one in my gyro and when he landed, instead of waiting in the runup area at the far end for me to do my thing he turned around and came back SLOOOOOWLY, with no radio call when he finally exited. I had actually beaten him to the pattern and gave way to him and that was the "teamwork" response (as seems typical and noted above, he was on an extended Final while I was on Downwind). Fortunately it was an excuse to slow-fly and fortunately nobody was behind me. But that seems typical: most everyone around here lets people go ahead to taxi to runup, etc. out of courtesy. Not sure I've seen a Cirrus pilot do that. In fact, if I wait in the runup area to let them come taxi down (in my fixed wing) they're more likely to come down, turn around, and take off ahead of me rather than wait their turn. So, to me, there sure seems to be a strong sense of entitlement among many of them, proficient pilots or not.