I find the notion that SMT fans "welcome newcomers" kind of hilarious. They're as elitist as it gets.
A vocal minority are, but most of us are glad to see people embracing the series, even if through P3/P4.
It sure as heck irks me when P3/P4 fans refuse to play the older games or worse find them unplayable, but what're you gonna do.
And I REALLY hate to say it, but that tidbit about P3/P4 fans is pretty accurate(Except the first one, that's just being a jerk). They talk more about their favorite social links and 'waifus' than the actual games, and they're quick to have no interest in games that aren't like P3/P4.
There's a good amount who are above that thankfully, but a lot who are not.
I find SMT old-schoolers are prone to more intellectual discussions about religion and law VS. chaos.