Today- I, probably like you, saw the series at the time it was first broadcast, a different time.
If we saw it now, we would not be offended.
But those born in a different time have different perceptions of humour, and part of moving forward, is accepting that what was once perfectly acceptable, may not ge so now.
I would hate to think that I wanted the world to fit in with my ideas about tastes and values - I certainly wouldn't want my parents' values forced on me.
That is how we.mofe and change, and accept that the world is increasingly less 'ours', and more our children's, and their peers.
And if that means missing an inconsequential joke in a sitcom, I can live with that