Parry said he has yet to see the letter and added: "I shouldn't be the story this week.
"The story should be the team and this is offensive to the manager, players and fans."
On Tuesday, the Reds beat Arsenal to go through to the final four of the Champions League for the third time in four years.
But there was further disruption off the field in a season that has been disrupted by internal wrangling in the boardroom.
Parry added: "I haven't seen the letter so you guys know more than I which says something.
"In a week in when we've had a great European triumph we should be talking about that. It is just more dirty linen being washed in public.
"No individual, certainly not me, is bigger than the club. The club will be fine but once again it shows there's a little bit of a lack of unity at the top. I'm just getting on with the job."