I find it a bit irritating that such an a/c which could probably have been able to squark mode "C" did not do so???
Hmm
Don't bite me but there are any numbers of reasons why you didn't pick up a squawk from him and not all would be due to an inconsiderate pilot.
What irritates me are people carrying PCAS (a minority of GA pilots) criticising other pilots for not squawking Mode C (a majority of GA pilots).
Yes, it would be nice if everyone did, but the reality is that the majority can't at the moment.