Sounds to me they don't realize what era they're living in. If they were all around 70 years old or so, then they grew up in the 30s. Keep in mind, back then, much much less was considered naughty and just about anything that went beyond genteel was flat out sex . Seeing a woman's leg above the knee almost unthinkable. Kissing in public was supposed to be no more than a social peck on the cheek, Hi how are you, darling, I haven't seen you in ages!, etc... And if you HAD to kiss your sweetie in public you did it where there was no one around...the field of a large park, inside your house...
I wouldn't chalk it up too 100% crotchetyoldpersonism (there's a tendency to live in the times you grew up in no matter how old you are) but they do need to realize that it's not the 1930's and 1940's anymore and that the social ettiquite they had drilled in their heads has undergone major changes since then.
I hear back then you also didn't cuss in public!