By calling a local ISP they explained to me that I cannot login because my password contains offensive language. Indeed it contained (I was angry with their arc

By calling a local ISP they explained to me that I cannot login because my password contains offensive language. Indeed it contained (I was angry with their arcane password rules) but... they had my plain text password?!? Okay this happened a decade ago and I also switched the provider promptly but how on earth anybody thought it was a good idea???