To summarize, what would make it gimme-pigish is expectations and attitudes. The number of invitees (why judge someone for having a lot of family and friends to celebrate with?), their financial situation (irrelevent), etc don't matter.
Do they expect/dictate the gifts or are they truly grateful for whateve (if anything) their family/friends choose to give?
Do they throw tantrums if someone cannot make it or are they happy that they get to spend time with those that can?
Do they express disappointment at not getting the exact thing they wanted or do they express thanks for the generosity of others?
Do they expect to be the center of attention always (this even outside of parties) or are they also interested in the lives of those around them?
Do they whine or refuse to attend other celebrations/help their friends but expect everyone to be there for them or are they there for their friends and family without keeping score of what they've gotten in return?
I don't think we can assign arbitrary numbers (be in number of parties, finances, or total guests), make a flat rule, draw a line and say "those over there are rude, and those over here are not."
It's about attitude and expectation and those things can't be measured concretely.