Marie Hatton was with her husband Bob and their nine-year-old great-grandson Ben when she was pushed to the ground by an Eagles fan after the two sides played one another.
"We were really disappointed to read about this," the Hull Daily Mail quotes Alexander as saying. "What was a good day out has been spoilt by two people who acted inappropriately.
"We pride ourselves on being a family club and this sort of thing doesn't do anyone any good. It's not what our football club is all about and it doesn't represent the behaviour of our supporters."
Mrs Hatton suffered a dislocated and shattered wrist as a result of the attack.