is his behaviour inappropriate

I've been dating someone for 6 months now. I've always found him to be very kind, caring and generous. However I noticed he would tell the odd sexist joke. I initially just laughed along and it didn't really bother me but in the past week I've met his friends and his family and realised they are all quite sexist! They all constantly make comments about how women cant drive... his dad will say about his wife "she cant do that..shes a woman" .. it is all said clearly as a joke but it is so annoying. One day we were in a car park and someone mentioned they had been in a small car crash and his dad said "was it a woman driving it?" When I met one of his close friends this friend was constantly leering and women and saying things like "phooorr look at that" and being very derogatory. It made me cringe! I've realised that most of his friends and family are like this!! He also says some of these comments too but I didnt realise how bad he was at it until he was round his family and friends!! The icing on the cake was when he met my family for the first time and he cracked a joke about female pilots on their periods crashing planes at certain times of the month. He was then patronising to my mum when she drove us home one day but stalled saying "there, there.... you can do it dear" I've spoken to my boyfriend about all this and his view is that it is all just a joke and I should lighten up. I know only I can decide if I think this behaviour is acceptable but I'd really appreciate other peoples views... would you continue to see a guy you like who has so many great qualities but who is a little sexist with some of his remarks/jokes or would you not be able to put up with it?

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