I usually don't let most jokes phase me, and don't mind crude jokes.
There are some jokes I find more distatesful than others though.
And there are jokes that, while it's not a case that I can't stand them, I really don't appreciate.
It probably sounds petty, but I don't appreciate jokes regarding the Royal Family, particularly the deaths of members of the family (such as Princess Diana jokes).
The only sort of joke I can't stand are ones that are directed at members of my family that come from people I know in person.