I am 6'3 285lbs (does this mean I'm disgusting? )and I've had a CFI who was 265 in the right seat. Along with a 145lb passenger in the back, full fuel and 120lbs of baggage. We were perfect. Zero issues.
However, I am in a PA-28 235 with a 1,417lb usable load.
The only way I wouldnt fly with a heavy passenger is if the CG was not within limits or they physically could not right in the plane. Personally I don't think pulling people out of the plane is a qualification that required, but each to their own. If that was a standard I'd be willing to bet 75% of all GA pilots would fly solo. I'd venture out to say that I'm the most able body member on the forum but if we crash and I get hurt, hopefully I can pull myself out... let alone the passengers.
I don't judge though, so just enjoy your 4 seater and roll within the limits. Good luck!
Neither do I, but then again, neither do I want them to block my egress from the plane either. The 177RG is a good plane for big people, it's the GA version of a Pacer crossed with a 928 Porsche; big doors, extra width, great visibility, decent performance.